Merge pull request #151 from mmicko/master

Enable DX11 for Win7 as well
Fixed OSX entry.
Fixed iOS entry.
Major imgui update. Imgui area and scroll are now separated. Also there are other minor aditions and improvements.
Merge pull request #152 from dariomanesku/master

Major imgui update.
Fixing scroll bug that was introduced with the previous imgui commit.
Merge pull request #153 from dariomanesku/master

Fixing scroll bug that was introduced with the previous imgui commit.
Fixed SDL2 entry.
Merge branch 'master' of github.com:bkaradzic/bgfx
Updated Blendish to latest.
Updated Blendish to latest.
Fixed Blendish warnings.
Added multiple windows example.
x11: Clear window after initialization.
Windows: Clear window after initialization.
DX9: Fixed swap chain depth creation.
Disabled dxerr, causes issues when building without DXSDK.
OSX: Clear window after initialization.
Added swap chain caps.
Updated README.