Merge pull request #36 from maraoz/master

issue #2: implement an alternate scan strategy for determining colorvalues
display help instead of crashing
Point setuptools back to petertodd's version of python-bitcoinlib. Use jimmysong's branch of pycoin until his testnet pull request is accepted.
Missed that Jimmy did his work in a branch, not master. Fixed.
Merge pull request #37 from arichnad/master

display help instead of crashing
Merge pull request #38 from Ademan/master

Change where setuptools looks for packages to reflect current events.
send the atoms in unit to the asset definition (untested)
testnet example (though this still doesn't work for me, so please fix these instructions).

also adding myself to contributors.
Merge pull request #39 from arichnad/master

Two commits:  using "unit" when creating a new asset, and an example on how to issue an asset
Merge remote-tracking branch 'upstream/master'