clean up grammar
uix:TextInput a) Proper handeling of on_focus for readonly TextInput
closes #940
b) Show `Paste` Bubble on long touch
c) Show only `Copy` Bubble if TextInput is readonly
fix #913 bad circle/ellipse for line instruction
uix:TextInput update style.kv to represent the changes for
TextInputCutCopyPaste
line circle/ellipse instructions, no need for +2 segments
make doubletap postproc more sensitive to the kind of touch

fix #901
Update doc/sources/installation/installation-linux.rst

fixing https://groups.google.com/forum/?fromgroups=#!msg/kivy-dev/BM-YXEeK3Ag/wJrhFWGIj2wJ
fix Image import so pil.pth isn't needed (ie. works with PIL and Pillow)
Merge pull request #951 from r1chardj0n3s/master

Fix an import and some minor grammar
Update kivy/modules/__init__.py

handle ImportError: try to import just by module name (in case it is user module, not kivy.modules.* one)
Merge pull request #953 from smishlayev/patch-1

Update kivy/modules/__init__.py
osx: fix image reloading when window is resized
shader: fix reloading vertex attribute, was b0rk due to a recent optimization in the shader. closes #948
ios: fix recent issue with Xcode, our SDKROOT variable is now conflicting with clang