Bug 1000239 - Create css sprite for tool icons on '/explore'
Merge pull request #703 from gesa/1000239

Bug 1000239 - Create css sprite for tool icons on /explore
Bug 997812 - Add links to /explore home page
Merge pull request #706 from gesa/997812

Bug 997812 - Add links to /explore home page
Fix Bug 1000969 - Update some of the language on Badges Detail page
Fix bug 1000267 - Add webmaker usernames to featured mentors
Fix bug 1000971 - Add support for issuer info
Fix bug 1001176 - Fix badges application slug