Add first simple implementation of StateStack (#79)
Refactor StateSettings (refs #79)
Renamed StateStack to StackedState and clean up code
Add more state queries to State::currentState
Merge remote-tracking branch 'origin/master' into statestack_79
Merge branch 'master' into statestack_79
Fix dereferencing const ref_ptr's (closes #143)
Merge remote-tracking branch 'origin/master' into statestack_79
Update FunctionCall.h

Remove GLOW_API from template
Merge branch 'master' into statestack_79
Merge pull request #149 from hpicgs/statestack_79

Statestack 79