fix for stash permissions, and github list pr files

add delete file for github and gitlab

fix gitlab repo encoding in commits from pr request

added list commits for pr

fixed gitlab's content.find

added create branch

return sha/blob_id for content.list

normalise sha in content, add bitbucket create/update

added GH changes return hash/sha of files changed

added support for comment parsing in GH webhooks, list commits for gi…

…tea/stash