Update find-and-replace to set the marker css
Upgrade syntax themes to remove find-result marker css

It is now in find-and-replace based on syntax-variables. Better!
Merge pull request #2816 from atom/bo-remove-fnr-marker-less

Remove fnr marker less from themes, and into fnr
Adjust DisplayBuffer::longestScreenRow when lines are inserted/removed

Fixes #2810

The line corresponding to the longest screen row moves when lines are
inserted or removed above it, so we need to adjust it accordingly or we
won't always realize when a change affects the longest line.
Upgrade to language-less@0.12
Upgrade to language-javascript@0.33
Upgrade tabs, fix flicker issue