CommandWithUpgrade: remove unnecessary args check; indentation fixes
behat: replace 'a P2 theme zip' step with 'wp theme install' call
Create `get_api_for_version()`, which will give us the proper download link for a given version
rename get_api_for_version() to alter_api_response() and use in plugin command
Merge pull request #463 from wp-cli/theme-version

theme install: --version parameter ignored