Texture cube support
-General texture support for texture cubes
-DDS and PVR support for texture cubes
FrameBuffer::createScreenshot lets you choose the format (RGB or RGBA)
It is now possible to update texture data without manually working with the texture handle.

Filtered file selection of #1513 and #1528
Removed Texture::Type::TEXTURE_UNKNOWN
Merge pull request #1558 from rcmaniac25/helpful-additions-textureCube-v3

Added support for Texture Cubes
Fixed GL_ASSERTS to GP_ASSERTS
Merge pull request #1561 from seanpaultaylor/next

Fixed GL_ASSERTS to GP_ASSERTS
Fixed #1562. Directory switch bug in Platform::displayFileDialog for Windows
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Merge branch 'next' of https://github.com/seanpaultaylor/GamePlay into next
Merge pull request #1563 from seanpaultaylor/next

Next
Merge branch 'next' of github.com:blackberry/GamePlay into helpful-additions-textureCube-v2

Conflicts:
	gameplay/src/FrameBuffer.cpp
	gameplay/src/Texture.cpp
	gameplay/src/Texture.h
	gameplay/src/lua/lua_Global.cpp
	gameplay/src/lua/lua_TextureType.cpp