Longer wait before focusing on search.

In my experience the timeout of 0 isn't long enough before focusing on the search input. I have to press ctrl+f twice in order for the search input to get focus. Setting a longer timeout of 100 fixes the issue, but still is instantaneous to the user.
Merge branch 'master' of https://github.com/eterevsky/textdrive-app
Added a setting for tabsize.

This is pretty standard for text editors, the way this code is set up (excellent job) makes it very easy to add settings.
Merge pull request #78 from matthewp/tabsize

Add delay before focusing on search, tabsize setting.