Bugfix: Use local proxy to query repository

Well, here we are :smile: As mentioned I integrated the both PRs [1][2] into my fork. There I found two issues.

This one covers the situation, where the repository is on the remote machine. The problem is, that the repository is given as local file path (on the remote machine and thus access the receipe cannot fetch the changelog and such. This PR makes use of the local proxy. That means, that if `:local_repository` is given, it is used instead of `:repository`.


[1] Ekino/EkinoNewRelicBundle#7
[2] Ekino/EkinoNewRelicBundle#5