Fix version V1 api for projects with numbers
Fix version V1 api for projects with numbers

If a project contains a number in its slug (ex: e2e-tests), the API /api/v1/version/e2e-test/latest/build/ raises an exception.

The regular expression wasn't expecting any number for the project slug
davidfischer/readthedocs.org,rtfd/readthedocs.org,safwanrahman/readthedocs.org,pombredanne/readthedocs.org,pombredanne/readthedocs.org,safwanrahman/readthedocs.org,safwanrahman/readthedocs.org,davidfischer/readthedocs.org,safwanrahman/readthedocs.org,rtfd/readthedocs.org,pombredanne/readthedocs.org,davidfischer/readthedocs.org,rtfd/readthedocs.org,davidfischer/readthedocs.org,rtfd/readthedocs.org