[BV-287] Added test to readme_use_case_spec.rb and updated README to show how to find a player by email.
Fixes #10 - Revised BaseResource#load to handle decoding newly added complex attributes on BadgevilleBerlin::Player.  Constrained activeresource versions to ~>3.1 (>= 3.1.0, < 4.0.0.) Incremented gem version to 1.0.2.
Adds :selector/:adjustment to COMPLEX_ATTRIBUTES for Group, Leaderboard, and Definition.
Merge pull request #11 from gsmith85/complex-attribute-leaderboard-fix

Adds :selector/:adjustment to COMPLEX_ATTRIBUTES for Group, Leaderboard, and Definition.
Pull request #11 - Added RSpec examples for COMPLEX_ATTRIBUTES usecases. Referenced MIT license in .gemspec. Updated gem version to 1.0.3.
[BV-4889, BV-4890] Fix bug where player update fails with 500 Internal Server Error. Extend BadgevilleBerlin::Player to support getters & setters for both nickname & nick_name.
[BV-4886] Test description changes only. Revise RSpec example descriptions for player preferences.
[BV-4866] Test fixes only. Restore configuration line for RSpec integration tests.
[BV-4887] Refactor mismatched names between GET (nick_name) & PUT/POST (nickname). Remove unneeded methods in BadgevilleBerlin::Player class. Revise customize_keys_for_request to always reference symbols, not strings, and then called it in BaseResource#load, not in BaseResource#sanitize_request. Revise RSpecs to show the nick_name= setter does not set nickname without the underscore.