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.
Clear timezone liberally during graph building, workaround for #1635.
Fix #1640 - Handle very small street edges (<1mm).
Update README.md
Fix #1644 (mark fields in OSM reader public).
update script to adapt to different OTP artifact names

we are now producing artifacts with version suffixes
Merge pull request #1626 from laurentg/fix-1625

Fix 1625
Merge pull request #1642 from laurentg/fix-1640

Fix #1640 - Handle very small street edges (<1mm).
Merge pull request #1636 from opentripplanner/timezone

Clear timezone liberally during graph building, workaround for #1635.
Merge pull request #1616 from 5Tsrl/it-translation

Complete Italian translation
Merge pull request #1645 from opentripplanner/osmreaderfields

Fix #1644 (mark fields in OSM reader public).