Minor PEP8 cleanup
Merge pull request #819 from rdtaylor/minor_pep8_cleanup

Minor PEP8 cleanup
Removing dead code from files backuptool.py through openbazaar.py
Merge pull request #820 from rdtaylor/remove_dead_code

Remove commented-out code
Removing dead code from orders.py through ws.py
Merge pull request #821 from rdtaylor/remove_dead_code_2

Remove commented-out code (part 2)
Friendlier error when using wrong --dev-mode params.

User is told in friendly english if she forgot to pass the server ip
when using development mode. Now development mode automatically
disables STUN check and UPnP.

Updated usage() string.

Now usage() is printed with new command 'openbazaar help'
unrelated pep8 fixes
fix on dev mode and private ip check

make one node a seed when on --dev-mode, let the other N-1
nodes know about the one seed.