translate README from markdown to reStructuredText
translate README from markdown to reStructuredText

Unfortunately github seems to favor markdown. There are some unpleasant
differences between the way the new and the old README look like. ReST
inline literals seem to be enclosed in <tt> tags, instead of <code>
tags, which are the default for markdown. Hope it looks better in pypi
...

xflash96/gitolite-sshkey-form,yongjhih/gitlolite-sshkey,xflash96/gitolite-sshkey-form,yongjhih/gitlolite-sshkey,yongjhih/gitlolite-sshkey,xflash96/gitolite-sshkey-form,xflash96/gitolite-sshkey-form