Add bin/ to the end of your PATH and tito-dev will run everything from
source checkout rather than what may/may not be installed on the system.
This includes the perl script in bin/ which land in /usr/bin normally.
Essentially always specifies --offline when calling tito, useful for
projects that are entirely local and do not consider any remote
reference authoritative.
Path hacks currently requiring this, though we still use python-nose
once it's time to actually call the tests. Still probably a solution to
get rid of the test script...
