Initial commit

Generated by "bundle gem derelict", in the parent directory.
Standardise on double quotes for string delimiters
Explain the gem's purpose in the README
Update description in gemspec
Add GitHub URL as homepage in gemspec
Increase specificity of Git ignore file

Some lines in the Git ignore file are intended to:
- only ignore directories (add "/" suffix to only match directories)
- only ignore when in the root (add "/" prefix to anchor to root)
Bump version in Gemfile to 0.1.0