Complete Italian translation

Revise and translate missing string
minor fixes...
Better translation of some UI labels
Make StreetEdge speed computation method public.
Fix #1625, add speed parameter to SPTWalker.

Also clamp time on maxTime from the request for optimization.
Correct typo in comment.
Remove spurrious line clamping speed to average.
Initial work on gtfs writing.
change field visibility so data can be accessed.
Basic GTFS writing support; fixes #1630.
Support for loading/saving shapes.
typo.
Make shape and stoptime immutable since they are stored in a MapDB. To change them, simply create a new one.
Always write agency_id.
Javadoc for Entity.Writer.
fix indentation on new branch.
remove @throws.
add comment to shapemap to clarify generics.
Use Iterators.concat to build iterator for calendardate.
Use google commons iterators to create calendar iterator; this also supports services with no calendar.