added reference in href for all pages, made a alphabetical menu in reference page, side menu bar still not floating at the right spot
Merge remote-tracking branch 'upstream/master'
added 3 exercises to parallel groupings
Merge remote-tracking branch 'upstream/master'
side bar now positioned at correct place, added 2 exercises for sequence group though the exercise structure is really similar to parallel one, need to think of more exercises
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
added a third exercise for sequence animation group, added some properties into references contents, contents for the third exercise still need update
moved toggleSolution function out of update() function
Merge pull request #30 from sandyphan/master

Updated contents in parallel and sequence animation, more exercises in these sections