Configured Grunt build system
fixed display error of toolbar button's dropdown mark on non-webkit browsers (IE, FF, Opera)
Merge pull request #450 from kyuri/upstream

fixed display error of toolbar button's dropdown mark on non-webkit brow...
Merge branch 'master' of https://github.com/vitmalina/w2ui
some pending code cleanup and expression whitespacing
regenerated library files
Merge remote-tracking branch 'remotes/vitmalina-original/master'

Conflicts:
	package.json
2-step to make sure the Gruntfile is case-correct: Gruntfile.js with capital G
step 2 of gruntfile --> Gruntfile rename.
Merge branch 'master' into w2window-work