Porting personal.importRawKey, personal.sign, personal.ecRecover from go-ethereum to web3.js (#565)

* Porting personal.importRawKey

* Porting personal.sign

* Porting personal.ecRecover

lib/web3/methods/personal.js

@@ -51,6 +51,25 @@ var methods = function () {
         inputFormatter: [null]
     });
 
+    var importRawKey = new Method({
+        name: 'importRawKey',
+		call: 'personal_importRawKey',
+		params: 2
+    });
+
+    var sign = new Method({
+        name: 'sign',
+		call: 'personal_sign',
+		params: 3,
+		inputFormatter: [null, formatters.inputAddressFormatter, null]
+    });
+
+    var ecRecover = new Method({
+        name: 'ecRecover',
+		call: 'personal_ecRecover',
+		params: 2
+    });
+
     var unlockAccount = new Method({
         name: 'unlockAccount',
         call: 'personal_unlockAccount',
@@ -74,7 +93,10 @@ var methods = function () {
 
     return [
         newAccount,
+        importRawKey
         unlockAccount,
+        ecRecover,
+        sign,
         sendTransaction,
         lockAccount
     ];