httpd: Add /raw route to get file at canonical head
Instead of requiring to specify a commit to obtain a file through the
/raw route, this commit allows to prefix /head to get the file at the
current canonical head commit.
Instead of requiring to specify a commit to obtain a file through the
/raw route, this commit allows to prefix /head to get the file at the
current canonical head commit.
LGTM :)
Use head() instead of canonical_head()
Rebase.