Added the hg case to LoadConfig, this allows Hg repos to be defined

in the config file. The HgRepository type has been created and

currently supports GetName, GetPath, GetFile & GetFileByCommit.

Interactions with Hg repos are done through Mercurial's command server

through gohg.

httpie was used to send GetName, GetPath, GetFile &

GetFileByCommit. GET requests requesting information from an Hg repo.

Each request yielded the expected result.