removed 'using namespace ...' from header files to avoid conflicts with other libraries
added some convenience functions to update UIElements without having to have references to them, i.e. by group name. Particularly helpful for button groups.
Merge pull request #16 from nselikoff/activate-group-item

Added some convenience functions to update UIElements
Merge branch 'master' into moving-graph-text

Conflicts:
	include/Graph.h
added release function in Graph