Revert 51f5017. Fixes #271.

Disabling sublime_auto_complete in the settings causes autocomplete to not work at all. Even with files/languages supported by SublimeCodeIntel. This commit simply re-enables sublime_autocomplete and reverts commit 51f5017. I've tested on Mac OS X 10.8.4 and Sublime Text 2.0.2 build 2221. For that platform, it fixes the issue.