fixed vs2013 compiling issue git issue #178
fixed imageslider not loading properly
refactored ofxUIImageSliders input to use set value, code cleanup
removed updateLabel from ofxUIEnvelopeEditor
added setKind method to ofxUIWidget
Replaced the call to 'fabs' by a call to the OF's ABS.
Merge pull request #181 from smallfly/hotfix/UISlider_fabs_ambiguous_call

Replaced the call to 'fabs' by a call to the OF's ABS.
removed ofxUIEnvelopEditor
Bug Fix in TextInput:
setTextring() must update cursor position