Make sure that the currently-set language is the
one that shows on the left sidebar if no language
preference exists.

ECOM-135
Pin coffee-script version to 1.6.1.
Add test for at least one group before saving a group configuration
Merge pull request #4959 from edx/diana/set-cur-lang

Make sure that the currently-set language is the one that shows on the left sidebar if no language  preference exists.
Merge pull request #4973 from edx/tim/single-group-is-ok

Update test_group_configuration_validation on single group allowed
Merge pull request #4969 from edx/benp/fix-js-tests

Pin coffee-script version to 1.6.1.

1.6.3 is causing some issues.
add Solano CI.
Merge PR#3. Solano: Add post worker hook for copying artifacts.
fixed capturing screenshots
adding post worker script