Package showing warning (Y U NO meme) when there are more uncommitted changes than set trigger. Inspired by vim plugin.

Feel free to fork, PR and file issues!

Big thanks to @dtinth whose fork has been merged into this package! Here are his changes:

• Made compatible with Atom 1.0.
• The overlay message will get bigger and bigger as you make more changes.
• Improved performance by calling the git diff --numstat command asynchronously, instead of checking the diff of all files in the whole repository using synchronous code.