[cpp] mark extern vars as extern.  Sort enum index for export
[cpp] add resources to cppia
Test dynamic version of math functions too.
[cpp] Add implements dynamic, optimize string calls, add Array.Any type for scripting
Make 'exists' functions not inline
[java/cs] Fixed override overloaded generic functions that return Void. Closes #3171
[java/cs] Support dynamic functions in interfaces. Closes #3159
[cs] Constants are never Null<> - fixed constants' mistype on constructors with constant parameters. Closes #3138
[TravisCI] install php 5.4 on Linux to avoid #3175