[Front-end] Migrated to use angular ui bootstrap modal
[Front-end] Removed backdrop on expanded cards
[Front-end] Replaced JS tooltip for skills with angular tooltip
[Front-end] Refactored code to have a cardModule of its own
[Front-end] Removed cardsFactory (was empty anyways) and added a cardService that takes in a list and spits back out a list of names
[Front-end] Replaced all tool-tips that display friends with Angular tool-tips
[Front-end] Made participant/friend list on expanded dynamic.
[Front-end] On click of join will close the expansion