Adds further installation instructions for OS X.
Merge pull request #1 from ben-eb/patch-1

Adds further installation instructions for OS X.
Merge branch 'release/0.2.4'

Fixed method documentation.
Merge branch 'master' of github.com:walling/node-rsvg

Forgot to pull in master (with newly added pull requests) before creating a release.
Merge branch 'master' into develop
Bumping version number.
Merge branch 'release/0.2.5' into develop

Including recent pull requests on GitHub.