Reorganized some code
Test script rename
Filename update
Allow the bitcoind URL setting to remain unset, with some loss of functionality
Adjusted the twonodes test data files to the current format
Simple code coverage test, using python-coverage. To be expanded in the future.
Ignore coverage output in Git
Ignore coverage output in Git (fix)
Added docstrings to the Bitcoind class, to aid in porting Amiko to other Bitcoin software
Added getPrivateKey method