Increment targetSdkVersion to 27

[audkar]

To increment version target to sdk 27 had to update other libs:

• build tools. Had dependencies:
  • gradle version
• then support lib had dependencies
  • DebugDrawer had old version dependency to support. Updated to new version
  • 3rd party material lib had old version dependency to support. Replaced with official material lib.
  • Material dialogs library had old version dependency to support.

Seems that location runtime permissions kinda works. Would be nice to have better UX to notify user what happens when user refuses location permission.

I couldn't find place where is used <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />. Maybe you know?

closes #72

[kwatkins]

Write external storage was used when we wrote the ow logs to the sdcard, since @ebabel moved that to sqlite we may be able to drop that perm.

[audkar]

Export Ride feature was writing file to external storage and then sharing that file. Moved it to cache folder and removed WRITE_EXTERNAL_STORAGE permission.