Added a rake spec task to execute the standard rspec_parallel command.

- Run all tests with `bundle exec rake spec`

Signed-off-by: James Myers <jmyers@pivotallabs.com>
Removed trailing newline from encrypted output.

- Base64.strict_encode emits proper base64 (no trailing newline)

Signed-off-by: James Myers <jmyers@pivotallabs.com>
spec_helper correctly resets the global config state before every test.

- Moved fog mocking out of SpecEnvironment.config
- Added caching of the default config between tests within a spec
- Removed rspec `around` usage that was breaking config setup

Signed-off-by: James Myers <jmyers@pivotallabs.com>
Replaced class methods with instance methods for custom_buildpacks_enabled

- Mocking the instance methods makes it easier to test app.rb
- The static method was inconsistant with other config getter methods

Signed-off-by: James Myers <jmyers@pivotallabs.com>