Update README.md

Remove sudo from brew command. 
https://github.com/Homebrew/homebrew/wiki/FAQ#wiki-sudo
Merge pull request #11 from sbeckeriv/patch-1

Remove sudo from brew command
Update README.md

I did not have cmake installed. Mac tests passed.
Merge pull request #14 from sbeckeriv/patch-2

Update README.md
Add libtool to OSX installs
Merge pull request #20 from andyfischer/master

Update README.md: Add libtool to OSX installs
Adding note about IRC channel in README.
Merge pull request #32 from cweagans/patch-1

Adding note about IRC channel in README.
Add Arch dependency instructions to README.md

Also accidentally clear trailing whitespace in README. vim autocommands ftw.
include a copy of the Vim License
Merge pull request #35 from thiderman/master

Add Arch dependency instructions to README.md.
Cleanup refactoring in main
README.md: link to the Contributing wiki page
Remove trailing spaces from gitignore
Added automake as a dependency when building on OS X. Otherwise build complaints of missing aclocal.
Merge pull request #47 from Coornail/ignore-test-vimrcs

Remove trailing spaces from gitignore
Add travis-ci configuration
Merge pull request #22 from cmrosenberg/osx-automake

Added automake as build dependency on OS X
First pass on getting build working on FreeBSD.
Clean up main.c:parse_command_name