build: rename binary from node to iojs

* rename the build targets

* update the test runner to use `out/{Debug,Release}/iojs`

* update the installer to install the iojs binary

* update one test that explicitly checks for the binary name

PR-URL: https://github.com/iojs/io.js/pull/262
Reviewed-By: Bert Belder <bertbelder@gmail.com>

node.gyp

@@ -73,7 +73,7 @@
 
   'targets': [
     {
-      'target_name': 'node',
+      'target_name': 'iojs',
       'type': 'executable',
 
       'dependencies': [