Remove unused test method
Remove unused polyline method
Fix printInt when value=INT_MIN (was overflowing)
Display warning when routing without street names.

Indeed, street names are optional for routing.
Remove duplicated point in polyline encoded data

First point was outputted twice.
Add test case.
Merge pull request #1094 from gberaudo/fixes

Several fixes: remove dead code, fix Int->String conversion for INT_MIN, remove duplicated coordinate from encoded polyline.