resolve warnings while compiling coreX11
Merge branch 'master' of https://github.com/kivy/kivy
Add an option to ScrollView to control what side of the view each of its scrollbars should be on.
Better docstrings
Fixed bar-sides and some whitespace
alias `bar_side` to (`bar_side_x`, `bar_side_y`)
Change bar_side to ReferenceListProperty

Merge https://github.com/kivy/kivy

Conflicts:
	kivy/uix/scrollview.py
Merge https://github.com/kivy/kivy

Conflicts:
	kivy/data/style.kv
Merge github.com:LogicalDash/kivy
bar_side -> bar_pos
Different way of detecting scroll type, to fit with the new way of specifying it
core: improve reloading of images on context reload.
doc: add observer callbacks to context,py
uix: remove experimental warnings from widgets that have been present
for a while
fix osc useage for client useage
Merge pull request #1708 from Zen-CODE/context_adds

doc: add observer callbacks to context.py
Merge pull request #1649 from LogicalDash/master

ScrollView scrollbars may be on the left or the top
uix:ScrollView minor fixes for #1649
uix:ScrollView fix bar pos calculation
gstplayer: first part of a native gstreamer player (not working, but the work base in done.). It also include pkgconfig() in setup.py that could be used to detect the availability of libs (SDL2 for example)