Uncomment eaglview release CCEAGLViewImpl-ios

This is leaking the eaglview when the Director is purged.

In our case, we are leaving the cocos environment on some views which
are implemented with cocoa, and because this eaglview is not being
released, it is getting notifications for keyboard events, and trying to
access stuff on the NULL eaglview, crashing our app.

Uncommnenting this line seems to fix the problem for us, and we haven't
been able to find any nasty side effects.
eaglview shouldn't be released here
fix sprite frame cache, and remove unnecessary headers dependencies.

we should add private headers for ccs, do not expose privae headers to users.
revert some modifications.
fix compile error.
refactor Widget flip logic
add button flip test
finish tests
fix momery leak (partly fix, memory leak still exist).
fix lua http download binary data's bug
- Optimization in CCClippingNode.
Disable visiting when no objects has to be drawn under stencil.
Update MathUtilNeon64.inl

add arm64bit  neon support
Fix WebView and VideoPlayer in wrong place on Android 2.3.x
- set const modifier to ClippingNode::hasContent()
fix compiling error caused by disable CC_ENABLE_SCRIPT_BINDING
Modify the cpp template & tests to support compiling wp8-xaml & win8.1-universal project by console.
add shader linking log

add shader linking log
Unify usage of prebuilt libraries in cmake builds.

* introduce config variable USE_PREBUILT_LIBS (default: ON). When OFF, cmake will not use prebuilt libs, only try find system installed libraries.
* FindGLFW3.cmake now search our prebuilt library (if USE_PREBULT_LIBS)
* FindFreetype.cmake also

This and next changes should simplify our CMakeLists.txt files and USE_PREBUILT_LIBS config allow external package developers to integrate cocos to their packaging system.
Unify WebP usage.
Fix WebP usage.

* Introduce config variable USE_WEBP (ON by default, but disabled for unsupported archs WINRT and WP8)
* Set CC_USE_WEBP define according to USE_WEBP variable
* add WebP include directories to search patch only for libcocos compilation (it not used in public headers)