Added style for changePassword.html

My change to the welcomeMsg div broke the layout for
changePassword.html, so I added some style to fix the layout.
Merge pull request #62 from anniezhn/azhang

Azhang
Conditionals content

Added some initial content for an exercise to the conditionals lesson.
Added draggable and droppable to some divs.
Merge pull request #64 from anniezhn/azhang

Azhang
(Joyce): tweaked some stuff in both lessons
Working example for conditional

Wrote JS to have example 1 be functional for conditionals.
Inserted conditional example into the master doc
Code for conditionals example 1
Cleaned up conditionals.html
Fixed theme CSS files
Merge pull request #65 from anniezhn/azhang

Quiz 1 things
Merge pull request #63 from anniezhn/master

Catch up with pushes