Update project build environment.

Summary:
Using the following development tools.
  - Android API 22.1.2
  - Gradle 2.2.1
  - Android Studio 1.0.2
  - Android Gradle Plugin 1.0.0
Create Google Cloud Endpoint.
Import Conference Central Endpoint.
Add ProfileForm argument to ConferenceApi.saveProfile.
Updating ConferenceApi.saveProfile.
Define Profile Entity.
Saving and Viewing Profile.
Implement ConferenceApi.getProfile.
Updating Profile.
Adding Tests To Your App.
Create Conferences.

Summary:
The following skeleton methods and classes were added for future implementation
purpose:
  - com.google.devrel.training.conference.domain.Conference
  - com.google.devrel.training.conference.form.ConferenceForm
  - com.google.devrel.training.conference.form.ConferenceQueryForm
  - com.google.devrel.training.conference.spi.ConferenceApi.getProfileFromUser
  - com.google.devrel.training.conference.spi.ConferenceApi.createConference
Save Conferences.
Query for all conferences.
Filter by ancestors.
Filter by property.
Suppressing Single Property Indexes.