Update README

- Update raw URL to new one[1][github]
- Delete MacVim from installable Homebrew packages
- Update with only 3 ViM plugins actually installed
- Delete all references to old Solarized colorscheme
- Delete all references to Pathogen

[github]:
https://developer.github.com/changes/2014-02-21-gist-raw-file-url-change/

Issue: #22
Update help file

Remove all mention of @necolas as its unnecessary and I wouldn't want
someone coming to him for questions on all of my changes and forked
goodness.

Issue: #22
Delete list flag and script sourcing

In favor of automating all app installation, remove the listing of apps
to install.

Issue: #22
Update Github raw URL

It appears that Github has changed their URL path for all raw files from
https://raw.github.com/ to https://raw.githubusercontent.com/

Issue: #22