fix doc (toctree), add hint to Factory when using dynamic classes form kv-lang in .py
py3 fix for animation, thanks to blarghmatey for reporting
Merge pull request #1366 from rentouch/doc_dynamic_class_and_factory

fix doc (toctree), add hint to Factory when using dynamic classes form k...
minor compatibility fixes making sure some widgets and examples are working with py3.3+ and 2.7.x
py3: try to get gi works on gst buffer
gstreamer use mem.get_memory(0) to get correct address
video_gstreamer: use Gbuffer size and MemoryView size to ascertain the
offset for video
Merge pull request #1367 from kivy/py3_fixes

Py3 fixes
Merge branch 'master' into inspector_properties