1. add debug opts like log-level for local env. 2. move no-colors opt as...

... settings variable
Suggest a  settings variable for handling casperjs logs in the local env.
# casperjs log level any of `info`, `debug`, 'warning`, `error`
CASPERJS_LOG_LEVEL = 'debug'
# also move non-test specific options to settings file (helps to deal with production(jenkins) or local env).
CASPERJS_NON_TEST_SPECIFIC_OPTIONS = {'no-colors': ''}