Merge pull request #16 from agudulin/bugfix

Fixed btn stylesheets in Chrome
There is no comic sans, let's use sans-serif in iOS

* Fix #11
Merge pull request #17 from agudulin/tkt_11

There is no comic sans, let's use sans-serif in iOS
Fixed sprite sizes
Use original sprite size after picking preview in tools panel

* fix #9
Merge pull request #18 from agudulin/tkt_9

Fixed sprite sizes
Added assets module