Added "Isolate" and "Integrate" support

Isolate is isolating the current post (tempopary move all the posts
excepts the current one), so generating is faster. It is useful, when
you are editing your post to see your changes faster.
Integrate moves other posts back.
Merge branch 'master' of git://github.com/goooseman/sublime-text-2-octopress into goooseman

Conflicts:
	README.md