Implemented mouse arcball for 3D interaction #157
Fixed PEP8 errors
Added terrain generation example
Added terrain generation example
Fixed docstring standard and removed unwanted lines
Fixed docstring standard and removed unwanted lines
Fixed docstring standard and removed unwanted lines
Fixes for qt apps related to selection and re-calling use()

Pyglet was higher in the list then PySide and PyQt4, making it
be selected earlier if both pyglet and PySide were in sys.modules.

repeatedly calling app.use() with 'PySide' or 'Qt' did not work
because the backend name is something like 'PySide (qt)'.
Null commit to trigger Travis

Test whether the qt segfault is reproducable or a glitch
Use faulthandler when running nose tests

For our lovely segfaults :)
FIX: Fix segfaults
FIX: Revert Qt changes
Replaced for loop with numpy code
Replaced missing linespace
Merge pull request #180 from Eric89GXL/qt-app-fixes-glfw-rebase

FIX: Qt app fixes
Removed arcball-code
Merge pull request #191 from mssurajkaiga/terrain

Terrain generation using scipy delaunay triangulation
Check that GLSL variable names are expected to work on any version of opengl
Flakify.
Merge pull request #197 from lcampagn/check-variable-names

Check shader variable names