add wrap-default-timeout && wrap-default-interval (#271)

* add with-wait-timeout && with-wait-interval

* update

README.md

@@ -1431,6 +1431,25 @@ The final form would be something like this:
     ...etc))
 ```
 
+In addition to `with-wait` and `do-wait` there are a number of waiting functions:
+`wait-visible`, `wait-has-alert`, `wait-predicate`, etc (see the full list in the
+[corresponsing section](http://etaoin.grishaev.me/etaoin.api.html#var-wait)). They
+accept default timeout/interval values that can be redefined using the
+`with-wait-timeout` and `with-wait-interval` macros, respectively.
+
+Example from etaoin test:
+``` clojure
+(deftest test-wait-has-text
+  (testing "wait for text simple"
+    (with-wait-timeout 15 ;; time in seconds
+      (doto *driver*
+        (refresh)
+        (wait-visible {:id :document-end})
+        (click {:id :wait-button})
+        (wait-has-text :wait-span "-secret-"))
+      (is true "text found"))))
+```
+
 ## Writing Integration Tests For Your Application
 
 ### Basic fixture

src/etaoin/api.clj

@@ -2033,8 +2033,19 @@
 ;; wait functions
 ;;
 
-(def default-timeout 20)
-(def default-interval 0.33)
+(def ^:dynamic *wait-timeout* 20)
+(def ^:dynamic *wait-interval* 0.33)
+
+
+(defmacro with-wait-timeout
+  [sec & body]
+  `(binding [*wait-timeout* ~sec]
+     ~@body))
+
+(defmacro with-wait-interval
+  [sec & body]
+  `(binding [*wait-interval* ~sec]
+     ~@body))
 
 (defn wait
   "Sleeps for N seconds."
@@ -2072,9 +2083,9 @@
   ([pred]
    (wait-predicate pred {}))
   ([pred opt]
-   (let [timeout   (get opt :timeout default-timeout) ;; refactor this (call for java millisec)
+   (let [timeout   (get opt :timeout *wait-timeout*) ;; refactor this (call for java millisec)
          time-rest (get opt :time-rest timeout)
-         interval  (get opt :interval default-interval)
+         interval  (get opt :interval *wait-interval*)
          times     (get opt :times 0)
          message   (get opt :message)]
      (when (< time-rest 0)