Replace first ~ with user.HomeDir, if possible
Lint in make test
Names are now case insensitive.

This should address issue #17. Names are stored in the server dict as lowercase and another user cannot take a different casing of that same name. However, a user may change their name to a different casing of their own name.
Added travis build status icon to README
Formatting, simplified motd.
Added note about make debug to README
Merge pull request #56 from empathetic-alligator/readme_travis

Added travis build status icon to README
Merge pull request #55 from empathetic-alligator/name_case

Names are now case insensitive.
Merge pull request #54 from peterhellberg/master

Replace first ~ with user.HomeDir, if possible