add Eclipse .project & .classpath for quick importing with EGit
set minSdkVersion="8" (Android 2.2)
add additional Gradle build (as secondary for Eclipse or for import into
Android Studio)
update import instructions
git clone --recursive (since Git 1.6.5, see
http://stackoverflow.com/questions/3796927/how-to-git-clone-including-submodules)
Merge pull request #12 from PaulVI/master

set minSdkVersion="8" (Android 2.2)