Linux: added project part for QtCreator.

Allows easily setup cocos2d on Linux in QtCreator IDE.
Enabled c++0x flag, use OpenAL audio backend by default.
issue #2305: use c++11 thread instead of pthread in CCTextureCache
issue #2305: tab -> 4 spaces
issue #2305: tab -> 4 spaces
Merge branch 'iss2305-replace-pthread' of https://github.com/minggo/cocos2d-x into minggo-iss2305-replace-pthread
issue #2305: use 4.7 toolchain to fix compiling errors
Using llvm 3.3 and android cxx-stl 4.7.
Updating bindings-generator.
Merge branch 'iss2305-replace-pthread' of https://github.com/minggo/cocos2d-x into minggo-iss2305-replace-pthread
[Travis CI] Removing space for before-install.sh.
clang+llvm-3.1 --> clang+llvm-3.3
Compilation errors in ScriptingCore.cpp fixes
issue #2322: Adding Property Sheet cocos2dx.props for sharing project configuration. Now it's only for linking libraries.
issue #2322: Macro CC_DLL take no effect now since we are using static library.
issue #2322: Action now is inherited from Object and Clonable now.
issue #2322: Fixing a warning in extensions/CCArmature/utils/CCDataReaderHelper.cpp.
closed #2322: Updating all win32 project configurations, improvement by using Multi-processor Compilation.
Merge pull request #2976 from dumganhar/iss2322-link-error

closed #2322: [Win32] Linking error when using multiply inheritance.
Merge branch 'minggo-iss2305-replace-pthread' of https://github.com/dumganhar/cocos2d-x into minggo-iss2305-replace-pthread