Github: handling branches containing '/'
Github: handling branches containing '/'

Prior to this, when processing the payload sent by the Github webhook
(via checkin.php), the commit() method would truncate a branch after the
first contained '/', i.e. 'dev/1.1.0' would be saved as 'dev'.

By using explode()'s limit parameter when splitting the branch ref we
get from the Github payload, we keep everything after the 2nd '/'.

Fixes #193

make-all/source-integration,mantisbt-plugins/source-integration,make-all/source-integration,dregad/source-integration,dregad/source-integration,dregad/source-integration,make-all/source-integration,mantisbt-plugins/source-integration,mantisbt-plugins/source-integration