Install bootstrap-slider
Add difficulty slider partial
Create difficulty slider widget
Link difficulty slider widget into widget chain
Add CSS center class
Update speed_test route to send back paragraph of given difficulty
Update sample paragaphs with difficulty level
Update speed test spec for difficulty slider
Merge pull request #88 from tiger-swallowtails-2014/difficulty_slider

Difficulty slider
created partial view for user profile
added my profile button and profile modal structure
added user's books to display within carousel
fixed JS, styled working carousel in user profile
resized modal
got sample chart to render within profile modal