Tell people to sign up for Heroku before deploying
Spell out "console" for students
Use code formatting
Tell people how to quit `rails console`
Students don't care about restarting the server

Having to restart the server is a pain for professional software developers, but
students have little exposure to these kinds of problems. They probably aren't
thinking about that at all, so let's just not mention it.

This also removes the word "Hawt", which could be taken the wrong way.
Remove stray quote
Encourage spelling out variable names

Change `msg` to `message`.
Explain the code snippet piece by piece
Encourage using path helpers like `topic_path`

Students can connect `topic_path` to the output from `rake routes`, but
probably can't do so with just `topic`.
Fix grammar collision

"By doing the following" should be followed by words that also end in "-ing",
not present-tense words.
Remove the word "spanking" from the curriculum
Use double quotes for quoting in prose
Whitespace
Add extra credit CSS from old curriculum
Add quotes and backticks
Explain database columns a little bit
Remove reduncancy