Drop the bare names that were sprinkled everywhere in the generated AST.

This closes #162

We make sure not to drop *explicitly written* bare names.
Add tests for &key arguments in functions
Add &optional arguments.

Python doesn't really have that concept, so make them clash with &key arguments.
Correct existing tests for future try / except work.
Allow returning inside a try / except. Closes #163
style tweak
Merge branch 'master' into pr/170
Merge branch 'master' into bugfix/paultag/fix-try-except
Allow kwapply for any expression.

This fixes #103.
Add some tests for kwapplying expressions
Try/Except: Ensure that we return properly

 From both inside a try and in an exception handler.
Added documentation about import
RST syntax fix
Docs: "Much more readable, no! -> Much more readable, no?"
Documenting: tuples and argument formatting
oh yeah, make this a clojure syntax block in the docs
Dictionary style keyword arguments documentation
Documenting classes!
Remove document classes TODO
Fixing documentation error with extra double-colon