add iterators to collection classes for easier syntax in c++11 and faster access
Merge branch 'master' of github.com:openframeworks/openFrameworks into feature-iterators
Merge branch 'master' of github.com:openframeworks/openFrameworks into feature-iterators
ofPixels: fix iteration in some methods
Merge pull request #3133 from arturoc/feature-iterators

add iterators to collection classes for easier syntax in c++11 and faster access