Fix minor typo

lin -> line
Add section on relative links in markdown

Recommend the use of relative links over absolute links when linking to internal content.
Add Git aliases for tags, branches and remotes

Taken from @mathiasbynens dotfiles: https://github.com/mathiasbynens/dotfiles/blob/master/.gitconfig
Merge pull request #16 from dideler/patch-2

Fix minor typo
Merge pull request #17 from matiassingers/master

Add Git aliases for tags, branches and remotes
Merge pull request #15 from dideler/patch-1

Add section on relative links
Merge branch 'master' of https://github.com/tiimgreen/github-cheat-sheet
Fix wording in Ja