Use the recommended constructor for robotium.Solo

This makes activity tracking work reliably when the main activity of the
application starts other activities immediately.

See https://code.google.com/p/robotium/issues/detail?id=179

Also fix some warnings at the same time.

Also tweak some build settings
* aapt is no longer a batch file on windows
* assets shouldn't be a source director for Eclipse
* libraries don't need to be added to the build path manually in Eclipse
Merge