updated WP8 shader compiler tool
updated wp8 precompiled shaders
added missing files and tests that broke wp8 build
added building wp8 shaders instructions
Merge pull request #7161 from MSOpenTech/wp8-v3-fix

Wp8 v3 fix
[AUTO][ci skip]: updating cocos2dx_files.json
Merge pull request #7162 from CocosRobot/update_cocosfiles_1403281523

[AUTO][ci skip]: updating cocos2dx_files.json