Allow options to be configured for request module

1. Allow default options to be configured at connector settings
2. Allow request options to be configured at operation level
Add tests
Merge tag 'v1.4.1'

1.4.1

 * Fix failing tests (Raymond Feng)
Merge pull request #22 from strongloop/feature/pass-options-to-request

Feature/pass options to request
v1.5.0
Merge branch 'release/1.5.0' into production