Allow use of X to mean random relay (or guard) for circuit_for_next_stream example
pep8 cleanups
pyflakes fixes
fix a couple API links in docs
Preliminary fix and test for Issue #47

(Should look more at Stem for things like this, probably...)
Merge remote-tracking branch 'meejah/master'

Conflicts:
	txtorcon/torconfig.py
Merge branch 'master' of github.com:isislovecruft/txtorcon