Set build target (& source) to Java 1.6

When compiled with JDK 7, Android was not able to Dex the resulting 
class files, and failed to include them in any APK. This made using the
test classes fairly difficult.
Ignore ANT build products
Add eclipse project files

Ignores eclipse build output too. Uses hard-coded references to 
dependent libraries, unfortunately.
Add missing default serial IDs

Suppresses eclipse warnings
Remove unneeded suppression annotations

The unneeded annotations were generating warnings themselves in eclipse.
Suppress raw type warning in eclipse