Optionally omit new lines in defn.
Merge pull request #35 from jeremyheiler/master

Optionally omit new lines in defn.
Add a rule discouraging the use of blank lines inside forms.
Start a section on mutation.
Prefer not= over not + =.
Add Mutation entry to the table of contents.
Add a bit more advice on the use refs, atoms and agents.
Rework the misc section into existential.
Add some predicate and function literal rules.