Add pixen
Added some engines and blogs&Portal
Merge pull request #21 from Phonbopit/master

Added some engines and Blogs&Portal
fix conflicts
Update project description
Merge pull request #24 from Zolomon/master

Add Game Development on StackExchange
Merge pull request #25 from Zolomon/master

Add Real-Time Rendering to Blogs/Books
Remove description on iforce2d
Merge pull request #27 from Zolomon/master

Add lessons and books
Merge pull request #28 from Zolomon/master

Add awesome book and KhanAcademy
Update README.md

add 2 engines - framework 2d
Update README.md
Update README.md

:+1:  @ellisonleao
Merge pull request #29 from Jarvizx/patch-1

Update README.md
Add PandaJS
Add board games section and sections short description
Update TOC
Add more portals and magazines
Add more 3d engines
Add Voxel editors subsection