Initial cut of `eval'
moving to locals; fixing _ast vs ast, adding tests
test hoisted functions too
Merging the two tests.
Accept strings as top-level expressions
Allow atoms (integers, booleans, symbols) as top-level expressions
Handle float and complex constants in addition to integer
Minor correction to repl template.  Added link to docs.
Merge branch 'master' into feature/site-corrections
Merge branch 'master' into paultag/feature/eval
moving atoms around to make it easier for internals.
Updating travis; exceptions.
Fixing the raised Exception.
Why is the blacklist not working?
Adding in on-the-fly-importing.
Avoiding breaking PyPy. Wat.
Adding in this barf of a hack beacuse it pleases me.
Update to the style.
Fixed typo in test_lex.py
Fixed typo in test_lex.py