0.2.0 Minos as performance tool

Minos now is based on commands:
ls shows scenarios but do not execute them. This substitutes --dry-run
verify with the main functionality of Minos 0.1.6
performance with new functionality to run performance tests vs a target

Also now the default is to run only scenarios which should have successful http codes as responses. A new flag -a can be passed to run all the scenarios.