BibUpload: improve bibdocfile URL recognition
BibUpload: improve bibdocfile URL recognition

* URLs such as http://localhost/record/00123/foo.pdf are now
  correctly recognized as bibdocfile URLs, when merging FFT
  MARCXML snippets. (closes #352)

tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio