[#6622] ticket:435  convert github markup
[#6622] ticket:435 Move github-markdown conversion methods to separate class
[#6622] ticket:435 Convert github mardown in tickets & comments
[#6622] ticket:435 Fix sha regex
[#6622] ticket:435 Fix ticket regex
[#6622] ticket:435 Fix user/repo@sha regex
[#6622] ticket:435 Fix user@sha regex
[#6622] ticket:435 Fix ticket regexs
[#6622] ticket:435 Fix code block regex
[#6622] ticket:435 Convert markdown in wiki
[#6622] ticket:435 Convert markdown in tracker
[#6622] ticket:435 convert user/project references into shortlinks

Because we don't know the proper mount point.
[#6622] ticket:435 Add newline at the begining of ticket comments

After 'Originally posted by' in ticket comments should be extra newline.
Without it some markup doesn't properly converted (e.g. code blocks).
[#6622] ticket:469 use new converter now
[#6622] ticket:469 handling github inline code
[#6622] ticket:469 improved regex
[#6622] ticket:469 fixed regex'es and tests
[#6622] ticket:469 not handling inline blocks, fixed parser
[#6622] ticket:469 A little refactoring and regexes fix
[#6622] ticket:494 Fix test failing due to new ticket regex