added build.gradle:
  - Maven Central used to resolve dependencies
Merge pull request #93 from StevenMohr/master

Added Gradle Support
Merge branch 'master' of https://github.com/uservoice/uservoice-android-sdk

# By Steven Mohr
# Via Austin Taylor (1) and Steven Mohr (1)
* 'master' of https://github.com/uservoice/uservoice-android-sdk:
  added build.gradle:   - Maven Central used to resolve dependencies