Automatically reload chrome dev ext after making changes

[minj]

Original issue 1277 created by minj on 2015-03-06T04:58:18.000Z:

Inspiration: https://github.com/adblockplus/buildtools/blob/master/chromeDevenvPoller__.js

Perhaps as a git hook: http://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks