mmandatory parameters inside PullRequest's methods are now checked.
added Repository::Commits inside docs nav
updated docs for PullRequests::all
updated ClientInterface: added delListener method
Make tests green again
implemented BranchRestrictions::all (API 2.0)
implemented BranchRestrictions::create (API 2.0)
implemented BranchRestrictions::get (API 2.0)
implemented BranchRestrictions::update (API 2.0)
implemented BranchRestrictions::delete (API 2.0)
Merge branch 'feature/api-v2' into develop

Implemented branch-restrictions endpoint.