Adds the following changes:
- 6b1e9ad Version bump to 0.5.10 - Hannah Wolfe
- 338e52f README & CONTRIBUTING updates - Hannah Wolfe
- 47e16df Node v0.12 & io.js support. - Fabian Becker
- 26508e6 Upgrading Casper to 1.1.7 - Hannah Wolfe
- fa93352 No more source maps in grunt prod - Hannah Wolfe
- 4b1ece9 Ensure correct url in ghost_head - Felix Rieseberg
- 69fb781 Remove Maps for icons - Paul Adam Davis
- eccf96c Update icon font unicode references - Paul Adam Davis
- b216677 Accept mailto: links - Hannah Wolfe
- 0eb74b5 Temporarily downgrade grunt-contrib-jshint - Hannah Wolfe
- 461834f Introduce new help menu - John O'Nolan
- 4e5cba8 Fixing overzealous trailing-slashes - Hannah Wolfe
- b7a80eb Users should get 5 password attempts - Hannah Wolfe
- 884d766 More serverside notificaiton HTML fixes - Hannah Wolfe
- 436d2a8 RSS: Don't add trailing '/' to post image - Felix Rieseberg
- 4cb7cff Remove button wrapping blog logo image - Paul Adam Davis
- c473303 Improve icon handling code - Paul Adam Davis