Web GUI now uses Chromium Embedded Framework.

Mostly works. On Linux there is annoying bug that causes X errors due to
excess mouse movements. It might be tied to GTK+ version.

Also inadvertently fixes upstream issue #80.
Merge branch 'develop' into cef

Conflicts:
	src/main.cpp
Updated the README.

* New asset package.
* Typo.
Harmonize the type of entity id and creates a general inclusion file.
Fix entity id type of BulletMover
change id entity type to a fixed sized of 32 bit
Merge branch 'develop' into cef

Conflicts:
	CMakeLists.txt
	src/systems/WebGUISystem.cpp
Disable support for 2x-sized framebuffers when running on rtina displays.
Added collision mesh scaling.
Merge pull request #122 from mcteo/develop

Added collision mesh scaling.
Merge pull request #121 from DeVaukz/develop

Fix a bug with Sigma on retina macs.
Updated the README. #80
Merge pull request #123 from danix111/new_readme

Updated the README.
Removed some moldy code and fix indenting
Final tweaks to enable proper specular
Added per material control of specular hardness and more control over spotlight settings
Final tweaks.
Added shader changes
Merge branch 'develop' of github.com:adam4813/Sigma into specular-merge
Merge pull request #130 from tanderegg/develop

Lighting Update: Improved spotlight beam, added in specular highlights