created py-getitem for hashtables and sequences
use elt instead of nth for the first arg to force an IndexError when necessary
use py-getitem instead of the inline code
created key-error condition for py-getitem
fixed parse-integer error handling for auto-numbering
allow '[' and '.' in field-name during getattr, detect unmatched '['
documenatation
initial import of tests
update README for py-getitem
README edits for clarity/style
Merge branch 'master' of https://github.com/felipeochoa/py-format