Modified versionCode in sdk build.gradle so it is incremental.
Modified versionCode in sdk build.gradle so it is incremental.

REVIEWERS
  Primary:    Kowshick
  Secondary:  Jose

DESCRIPTION
  Modified versionCode in sdk build.gradle so it is incremental.

UNIT AND/OR INTEGRATION TEST COVERAGE
  No -- Changes do not affect SDK functionality.

appnexus/mobile-sdk-android,appnexus/mobile-sdk-android,appnexus/mobile-sdk-android,appnexus/mobile-sdk-android,appnexus/mobile-sdk-android