integrate RPC v2 via develop

* integrate #2035 via latest develop. fixes #2041
* refactor apis
* fix tests for windows, add simple download test
* separate dns api and chequebook api
* http proxy api in separate subpackage
* remove legacy rpc code partially, adding only legacy to make v2 work
* TODO: add dns tests see #2048
* TODO: further refactor  due to #2040

common/chequebook/api.go

@@ -0,0 +1,29 @@
+package chequebook
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+const Version = "1.0"
+
+type Api struct {
+	ch *Chequebook
+}
+
+func NewApi(ch *Chequebook) *Api {
+	return &Api{ch}
+}
+
+func (self *Api) Issue(beneficiary common.Address, amount *big.Int) (cheque *Cheque, err error) {
+	return self.ch.Issue(beneficiary, amount)
+}
+
+func (self *Api) Cash(cheque *Cheque) (txhash string, err error) {
+	return self.ch.Cash(cheque)
+}
+
+func (self *Api) Deposit(amount *big.Int) (txhash string, err error) {
+	return self.ch.Deposit(amount)
+}

eth/downloader/modes.go

@@ -35,14 +35,15 @@ const (
 	TxPoolApiName   = "txpool"
 	PersonalApiName = "personal"
 	Web3ApiName     = "web3"
+	ChequebookApiName = "chequebook"
 
 	JsonRpcVersion = "2.0"
 )
 
 var (
 	// All API's
 	AllApis = strings.Join([]string{
-		AdminApiName, BzzApiName, DbApiName, EthApiName, DebugApiName, MinerApiName, NetApiName,
+		AdminApiName, BzzApiName, ChequebookApiName, DbApiName, EthApiName, DebugApiName, MinerApiName, NetApiName,
 		ShhApiName, TxPoolApiName, PersonalApiName, Web3ApiName,
 	}, ",")
 )