Remove autosave. It will come back in the form of saving the session (#20).

Issue #159
Remove autosave. It will come back in the form of saving the session (#20).

Issue #159
Remove 'autosave' option from settings.
Merge branch 'auto' of github.com:GoogleChrome/text-app into auto
Merge pull request #211 from GoogleChrome/auto

Remove autosave. 
Close #159