Codiad/Codiad — pull request #707 by Andr3as (2014-09-14 17:18:12+00:00)
Title: Fixes history after renaming active files

Situation:
- Two or more open files
- Switch several times between different files to create a history
- Rename active file
- Switch to another open file
- Causes error (prevSession is undefined) on [active.highlightEntry](https://github.com/Codiad/Codiad/blob/master/components/active/init.js#L427-L429)