First functional version of custom Signature view done.
Renamed two dialog XMLs
More plumbing laid in for signatures:
1. Changed look of signature dialog (added paper background)
2. Updated SignInSheetActivity to get a scaled-down bitmap from
SignatureDialog.
SignatureView can now handle device rotation.
Fixed help dialog layout in landscape mode.
Bugfix for search field and for rotation.
Fixes #21: Deleting project leaving pending participation orphaned.