Update references from GitHub to Wikimedia and remove Travis

Also:
* Removed redundant `--recursive` argument in the git clone as
  we don't have any submodules.
* Removed "bugs" property as there is no clean url for the oojs
  project within bugzilla, and we don't really need it listed at
  npm anyway.

Change-Id: If9b93caab309434acc5ed431166b9ee44de8a76f