added specs for new resource bookmarklet
added specs for resource ratings
added specs for user profile
added specs for admin sortable courses
added more specs for to_bool extension
deleted unneeded builder base class
added spec for stackoverflow omniauth connect
tweaked user profile
added specs for resource voting
added github repo integration into project completions
refactored user model
simplified prereq validations
slightly refactored github api methods
added markdown renderer for project fields
added gist creation for skill presentations