Allow to force HTTPS scheme

If the standalone GitBucket instance runs behind HTTPS proxy, the
repository URL always shows HTTP scheme dispute the fact that the
connection is HTTPS. This patch is adding a command line option which
allows to force the HTTPS scheme.
Merge remote-tracking branch 'upstream/master'
Refactorization of the https command line option

Renaming the flag variable and the Connector class.
Fixing command line options in init.d script

Adding missing "--host" option and fixing the declaration of other
command line options.
Exclude owner from assigned user list in the group repository.
Don't add group account as a collaborator.
Add the commit link to refs comment.
Fix style problem in Wiki.
Merge branch 'master' of https://github.com/takezoe/gitbucket
(refs #104)Zip file is exported from the bare repository directly.
Fix refs message.
Merge pull request #170 from jtyr/master

Allow to force HTTPS scheme
Small fix for #170
(refs #171)Fix link target of pull request number.
Update README.md
(refs #174)Fix commit hook for DELETE command.
Update README.md
Update README.md
Update README.md
Version bump in spec file