fixed comment in Texture.h re: default wrap for Texture
Added VboMesh to ES2, with various improvements; Fixed cylinder normals.
- compiled out non-ES2 code from VboMesh
- added gl::Draw( Vbo* ) back to gl.*
- Added addStaticCustomFloat* to vbo layout
- Added set and getIndicesType, and getSizeOfIndicesType() to Vbo layout. Can now use GL_UNSIGNED_INT, GL_UNSIGNED_SHORT, and GL_UNSIGNED_BYTE. ci::gl::draw uses appropriate types. Throws errors if type mismatch is attempted. Not tested yet.
- add a cached VAO to VboMesh;  bindVao(), unbindVao() methods.
- gl.cpp can use vao to draw vbo meshes.
- destroy VAO cache in VboMesh when custom locations are changed (detect actual changes).
- fixed normals for cylinders with non-uniform radii.