Cleans up the Linux section of the README and adds a distro-specific dependencies section which is not only much more clear, but also encourages others to add different distributions. I also added a note in the custom mount page to make sure that the $user variable's value is understood.
Merging in changes for Fedora instructions and note
Merge branch 'master' of https://github.com/owncloud/documentation
Merge branch 'master' of github.com:Trae32566/owncloud-documentation