Open 1.0.0 for development
prepare for api v2: add extended ECKey and Crypto Helper
cleanup
prepare lib for multi-version, multi-environment
implemented API v2 with full v1 backward compatibility
flexible constructor, newv2 endpoints
fix uncaught typo in _withdraw logic
Adapt tests to differentiate between api versions

for version=1: test get_address_received (depreciated after v1)
for version=2: test get_address_balance instead
Pre-enable dtrust api endpoints for 1.0.0
Set default version to 2
Merge 1.0.0 into master

This enables v2 api.
updated readme for 1.0.0