Fix SDL joystick
SDL host sets MOAIEnvironment values for screen size (all OS's) and DPI (Windows only)
support screenDpi to Linux
fix screen DPI for Linux;
support for 1 and 4 bit image formats
updated expat to 2.1.0; fixed misc Android build errors; removed unused MOAIGlyphCacheBase
tweaks to android build
fix for missing texture deallocation report (due to debug name being cleared prior to gpu destroy)
Merge pull request #1026 from patrickmeehan/develop

Changes to MOAIActionMgr, MOAIInputMgr, graphics resource lifecycle
Merge pull request #1028 from daltomi/sdl_joystick

Fix SDL joystick; minor ref.
Merge pull request #1031 from DanielSWolf/environment-info

SDL host: set additional MOAIEnvironment values
fixed xcode compile error