Update to gravity 1.2.0

[nsoranzo]

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[nsoranzo]

I am a bit cheating here: I've rebuilt the config samples with gravity 1.2.0 + the patch from galaxyproject/gravity#140 .

Test failures unrelated.