Give higher precedence to eruby.foo subtype

Closes gh-23.
Update README for full github migration
Update all RubyForge URLs with new GitHub equivalents.
Preliminarily drop gems from path

As discussed in gh-32:

1.  It's slow.
2.  It puts multiple versions of gems in the path, sometimes with older
    gems coming before newer gems.
3.  Does anyone actually want this?

As to #3, let's try dropping it and see if anyone even notices.
Adds require_relative highlighting
Pass v:lnum as an argument to GetRubyIndent
Add an example for ruby indenting

The closest to automated testing we're probably going to get.
Fix nested hash problem

A few regex variables have been renamed to make it a bit clearer what's
going on.
Descriptions for the cases in the indent example
Option to control hanging indent
Update own email
Fix {if: foo} highlighting

Closes #44
Merge pull request #41 from AndrewRadev/nested-hash-fix

Nested hash fix
New 'path' generation

The 'path' is now simply Ruby's load path, prefixed with the global
'path' if it was set to a default value.  Notably, this means the
current working directory is only included if Ruby itself included it
(true on 1.8, but not 1.9).

Closes #32.
Map gf to prevent editing directories
Cheat gf on autoload
Switch compiler to RSpec 2

Closes #16
Claim abandoned runtime files

I'm operating under the assumption that since it's been 3 years since
the migration to GitHub and neither of these guys has joined the
project, these files are abandoned.
Update contributors
Partial cleanup of README