Merge pull request #516 from am11/master

Install: Bind to specific binaries commit
Fix binary download URL
1.2.1
Use gaze 0.5.1

0.6.4 doesn't include pre-built binaries which makes it incompatible with systems
without Python installed.

Fixes #518
Add test for watching files
Merge pull request #519 from kevva/test-watch

Add test for watching files
1.2.2