[internal] switching output from spaces to tabs

more consistent with how XCode does it

Author: alunny

lib/pbxWriter.js

@@ -1,7 +1,7 @@
 var pbxProj = require('./pbxProject'),
     util = require('util'),
     f = util.format,
-    INDENT = '    ',
+    INDENT = '\t',
     COMMENT_KEY = /_comment$/,
     EventEmitter = require('events').EventEmitter
 

test/pbxWriter.js

@@ -7,7 +7,7 @@ function testProjectContents(filename, test) {
         content = fs.readFileSync(filename, 'utf-8');
 
     // normalize tabs vs strings
-    content = content.replace(/\t/g, '    ');
+    content = content.replace(/    /g, '\t');
 
     myProj.parse(function (err, projHash) {
         var written = myProj.writeSync();