Introduce a package of mastercoin related tools.

The intention is to help finalizing the spec, and enable easy further coding.
It is based on https://github.com/spesmilo/sx with minor fixes on
https://github.com/grazcoin/sx

For finalizing the spec, a list of address and mastercoins is generated.

To get all mastercoins sells during exodus bootstrap in csv format:
python msc_bootstrap.py > outputs/bootstrap.log

To get total amount of mastercoins for each address:
python bootstrap_msc_per_address.py > outputs/msc_per_address.csv

To get the whole bootstrap story (for fun and debug), check:
python msc_bootstrap.py story > outputs/bootstrap_story.log

The outputs of those scripts are available under outputs directory.
mastercoin purchased during bootstap go to the most paying address

change the mastercoins distribution algorithm:
the highest paying address in bootstrap tx gets all mastercoins