init: support deep scrubbing for werkzeug json bodies;
setup: bump to version 0.7.1
init: support py2.6 and 3
scrub_params: fix bug, use replacement character for deep dictionary scrubbing
do not assume params are dictionaries before scrubbing
Merge branch 'master' of https://github.com/Affirm/pyrollbar into merge-pr-19
add test for scrubbing None