Remove automatic second line, fix a crash, a little refactoring

Hi, first of all thanks for the app :)
I made this pull request because I though adding "Notable" as a second line to single-line notifications was a bit irritating so I removed it. If you had a special reason for adding that second line, maybe we can discuss a better way to do that.
Also, I fixed a crash in the following case. Create a reminder, then click the notification to open its detail view, dismiss the reminder, then go to Recent Apps and click Notable. The app crashes because it tries to open a detail view for a reminder that has already been deleted.
Finally, I made a little refactoring, most important of which is making the Notable app inherit the library's manifest instead of copying it. It has a small downside that ADT doesn't find the launcher activity (which is its bug) so when you launch the app from Eclipse, it just installs it but doesn't launch it. I think this is an acceptable price for not having to duplicate every change that you make to the library's manifest.
Looking forward to getting these changes as an update from Play :)