Removes local copy of ShadowTextToSpeech

Changes merged into robolectric/master

https://github.com/robolectric/robolectric/pull/1239
Merge pull request #275 from mapzen/chuck/remove-shadow-text-to-speech

Removes local copy of ShadowTextToSpeech
testing a different stratedgy for generating route path
simplify bounding box gathering from path in route preview
builing path dynamically based on bounding box
handing reroute drawing with the same on demaind path drawing