Publish Javadoc jar from Gradle build

In order to take advantage of JitPack's automatic Javadoc publication
service documented at https://jitpack.io/docs/#features.

This should result in bisq-core Javadoc being browseable at
https://jitpack.io/network/bisq/bisq-core/-SNAPSHOT/javadoc.

Note that JDK 8's aggressive 'doclint' warnings and errors had to be
suppressed here. See the following link for details:
http://blog.joda.org/2014/02/turning-off-doclint-in-jdk-8-javadoc.html.

Also note that several ugly Javadoc warnings coming out of Dispute.java
were un-suppressable, apparently for reasons described at
https://stackoverflow.com/q/29902718.

build.gradle

@@ -12,6 +12,20 @@ tasks.withType(JavaCompile) {
     options.encoding = 'UTF-8'
 }
 
+javadoc {
+    options.author = true
+    options.addStringOption('Xdoclint:none', '-quiet')
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
+artifacts {
+    archives javadocJar
+}
+
 repositories {
     jcenter()
     maven { url 'https://jitpack.io' }

src/main/java/bisq/asset/Asset.java

@@ -19,8 +19,8 @@
 
 /**
  * Interface representing a given ("crypto") asset in its most abstract form, having a
- * {@link #getName() name}, e.g. "Bitcoin", a {@link #getTickerSymbol() ticker symbol},
- * e.g. "BTC", and an address validation function. Together, these properties represent
+ * {@link #getName() name}, eg "Bitcoin", a {@link #getTickerSymbol() ticker symbol},
+ * eg "BTC", and an address validation function. Together, these properties represent
  * the minimum information and functionality required to register and trade an asset on
  * the Bisq network.
  * <p>

src/main/java/bisq/core/offer/OfferUtil.java

@@ -40,9 +40,6 @@ public class OfferUtil {
 
     /**
      * Given the direction, is this a BUY?
-     *
-     * @param direction
-     * @return
      */
     public static boolean isBuyOffer(OfferPayload.Direction direction) {
         return direction == OfferPayload.Direction.BUY;
@@ -51,12 +48,7 @@ public static boolean isBuyOffer(OfferPayload.Direction direction) {
     /**
      * Returns the makerFee as Coin, this can be priced in BTC or BSQ.
      *
-     * @param bsqWalletService
-     * @param preferences          preferences are used to see if the user indicated a preference for paying fees in BTC
-     * @param amount
-     * @param marketPriceAvailable
-     * @param marketPriceMargin
-     * @return
+     * @param preferences preferences are used to see if the user indicated a preference for paying fees in BTC
      */
     @Nullable
     public static Coin getMakerFee(BsqWalletService bsqWalletService, Preferences preferences, Coin amount, boolean marketPriceAvailable, double marketPriceMargin) {
@@ -69,12 +61,6 @@ public static Coin getMakerFee(BsqWalletService bsqWalletService, Preferences pr
 
     /**
      * Calculates the maker fee for the given amount, marketPrice and marketPriceMargin.
-     *
-     * @param isCurrencyForMakerFeeBtc
-     * @param amount
-     * @param marketPriceAvailable
-     * @param marketPriceMargin
-     * @return
      */
     @Nullable
     public static Coin getMakerFee(boolean isCurrencyForMakerFeeBtc, @Nullable Coin amount, boolean marketPriceAvailable, double marketPriceMargin) {
@@ -101,13 +87,6 @@ public static Coin getMakerFee(boolean isCurrencyForMakerFeeBtc, @Nullable Coin
     /**
      * Checks if the maker fee should be paid in BTC, this can be the case due to user preference or because the user
      * doesn't have enough BSQ.
-     *
-     * @param preferences
-     * @param bsqWalletService
-     * @param amount
-     * @param marketPriceAvailable
-     * @param marketPriceMargin
-     * @return
      */
     public static boolean isCurrencyForMakerFeeBtc(Preferences preferences, BsqWalletService bsqWalletService, Coin amount, boolean marketPriceAvailable, double marketPriceMargin) {
         return preferences.getPayFeeInBtc() ||
@@ -116,12 +95,6 @@ public static boolean isCurrencyForMakerFeeBtc(Preferences preferences, BsqWalle
 
     /**
      * Checks if the available BSQ balance is sufficient to pay for the offer's maker fee.
-     *
-     * @param bsqWalletService
-     * @param amount
-     * @param marketPriceAvailable
-     * @param marketPriceMargin
-     * @return
      */
     public static boolean isBsqForFeeAvailable(BsqWalletService bsqWalletService, @Nullable Coin amount, boolean marketPriceAvailable, double marketPriceMargin) {
         final Coin makerFee = getMakerFee(false, amount, marketPriceAvailable, marketPriceMargin);