Merge pull request #28 from leplay/master

 fix button focus style
[Feature] Add checkbox
[Polish] Polish Compass build config
Merge pull request #29 from ivanzhaowy/master

Add checkbox
Adjust generated images position.
Merge pull request #30 from ivanzhaowy/master

Adjust generated images position.
Update .gitignore
Merge pull request #31 from ivanzhaowy/master

Update .gitignore
Add background fallback to button
Merge pull request #32 from netputer/master

Add background fallback to button