update PTE

adding support for Rostock
fixes unicode issue in BVG auto-complete
number of departures is now respected

Conflicts:
	src/de/grobox/liberario/LocationAdapter.java
move reverse button in favorite trip view to the right
release version 0.5.1

- Station position is now shown in calendar export and shared trip text
- Long press on products now shows their name
- Special connection messages are shown in red and without HTML code
- Updated PTE: Added support for Rostock (RSAG), fixed encoding errors in auto-completion, fewer departures shown