Add test for ContinueStatement

Author: fvictorio

Foo.sol

@@ -0,0 +1,5 @@
+abstract   contract   Config 
+{
+      function lookup(uint id) public
+virtual returns (address adr);
+}

tests/AllSolidityFeatures/AllSolidityFeatures.sol

@@ -411,3 +411,9 @@ contract multilineReturn {
       5;
   }
 }
+
+contract continueStatement {
+  function a() {
+    while (true) { continue; }
+  }
+}

tests/AllSolidityFeatures/__snapshots__/jsfmt.spec.js.snap

@@ -414,6 +414,12 @@ contract multilineReturn {
       5;
   }
 }
+
+contract continueStatement {
+  function a() {
+    while (true) { continue; }
+  }
+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // Examples taken from the Solidity documentation online.
 
@@ -874,4 +880,13 @@ contract multilineReturn {
     }
 }
 
+
+contract continueStatement {
+    function a() {
+        while (true) {
+            continue;
+        }
+    }
+}
+
 `;