Compatability with BINARY internal encoding

- Specify the default_internal encoding as UTF-8 when reading source
  files. This fixes Issue #127.
allow global configuration with ~/.simplecov
Updated README.md to add syntax highlighting
Merge pull request #198 from parndt/patch-1

Updated README.md to add syntax highlighting
Merge pull request #195 from spagalloco/user-global-configuration

allow global configuration with ~/.simplecov
Merge pull request #200 from infertux/on_ruby

Refactor on_ruby helper to handle Ruby 2.0
Merge pull request #194 from justfalter/fix_source_encoding_error

Compatability with BINARY internal encoding
Fix the build for MRI 1.9.2 and 1.9.3

RSpec 2.0 is buggy
Fix wrong indentation from b9d689f