Default to latest SDK (API Level 17)
.classpath update from Eclipse.
Deprecate redundant interfaces

Many of the interfaces are exact duplicates of ones from GLSurfaceView
and, as far as I can tell, add no value. While integrating the latest
code into the downstream Rajawali framework, I found these interfaces to
be a nuisance. Our classes, which already implement the GLSurfaceView
interfaces, were not considered valid to the GLWallpaperService.

GLWallpaperService has been modified to accept the GLSurfaceView
interfaces. To maintain backwards compatibility, the redundant
GLWallpaperService interfaces have been changed to empty extensions of
their GLSurfaceView counterparts, but marked as deprecated. The downside
of keeping the interfaces for backwards compatibility is that
"GLSurfaceView." had to be prefixed onto many declarations.
Deprecate redundant GLWrapper interface

This interface was missed in the previous commit.
Updated documentation for contributors
Renamed readme-contribute.txt to readme-contribute.md for markdown support on github
Converted readme-contribute.md content to Markdown
Corrected testing instructions
Removed reference to deprecated GLWallpaperExample project
Updated links to new project repository URL and library download link
Updated information about the Android SDK
Renamed release-notes.txt to release-notes.md for Markdown support
Converted release-notes.md content to Markdown
Merge branch 'documentation-update'
Updated NOTICE file with new attribution. Thanks, Jay Weisskopf.
Merge branch 'pull-request-25'
https://github.com/markfguerra/GLWallpaperService/pull/25