ensure we use integers for node abi version - in the case of node v0.11.3 this…

ensure we use integers for node abi version - in the case of node v0.11.3 this converts 0x000C -> 12

lib/binary_name.js

@@ -12,7 +12,7 @@ var Binary = function(options) {
   this.platform = options.platform || process.platform;
   this.target_arch = options.target_arch || process.arch;
   if (process.versions.modules) {
-    this.node_abi = 'node-v' + process.versions.modules
+    this.node_abi = 'node-v' + (+process.versions.modules);
   } else {
     this.node_abi = 'v8-' + process.versions.v8.split('.').slice(0,2).join('.');
   }