fix to cone for use with getMeshForIndices and warning in getMeshForIndices if an index is less than zero
added getMeshForIndices with only 2 args in ofMesh
cleaned up debug messages
Merge branch 'develop' of https://github.com/openframeworks/openFrameworks into feature-3dGraphics
Changed endIndex in ofMesh:: setColorForIndices and ofMesh::getMeshForIndices to be last index and not total. Changed appropriate variables in of3dPrimitives to account for change in indices.
Revert "Changed endIndex in ofMesh:: setColorForIndices and ofMesh::getMeshForIndices to be last index and not total. Changed appropriate variables in of3dPrimitives to account for change in indices."

This reverts commit b4cfbed4694703ed9b57964094c456ac27cac15f.
Merge pull request #2259 from NickHardeman/feature-3dGraphics

Bugfix 3d graphics