Change "wm" to "Margin"
Convert to markdown
Tidied up README.md
Change text-mode to text-mode-hook
Merge pull request #3 from nslater/mode-line-change

Change "wm" to "Margin"
Merge pull request #4 from nslater/readme-formatting

Readme formatting
Merge pull request #5 from nslater/fix-hook-doc

Change text-mode to text-mode-hook