Adding use_http_urls

[rostskadat]

Hello,

There is a use case where one wants to use HTTP URLs instead of SSH base
URLs. This commit adds the use_http_urls setting and modify the
merge_request_details and payload_request_details in order to use the
new git_http_url field of the JSON payload.

[javiplx]

Test are failing (see TravisCI). Would you mind to have a look? (the jruby-1.7-19mode ones are probably causing failures on acceptance tests).
If you make the pull request against https://github.com/javiplx/jenkins-gitlab-hook-plugin, travis should launch automatically

[rostskadat]

@javiplx : Sorry for the late answer. I looked at the build logs and I'm a bit confused: It seems that it fails in ./models/util/settings.rb:4 saying basically undefined method `descriptor' for nil:NilClass.

• The refered class is jenkins.model.Jenkins. For some reason the class is not instanciated.
• I'm not really sure how to find out why the class is not properly instanicanted.

=> Could you tell me maybe how to turn debug during the tests?

Thanks