add support for multi-line labels
Merge branch 'master' of https://github.com/rezaali/ofxUI into fix-multiLineLabel

Conflicts:
	src/ofxUILabel.h
Merge branch 'develop' of https://github.com/rezaali/ofxUI into fix-multiLineLabel

Conflicts:
	src/ofxUILabel.h
Merge pull request #87 from thiagohersan/fix-multiLineLabel

add support for multi-line labels