improves ParsedString
updates lot parser to return Lot instance
removes unused keyword_parser
updates yatsh session
exchanges example to json format
adds default attributes
Merge pull request #4 from rodrim3n/json

adds default attributes
removes comments
Merge branch 'json' of github.com:farfanoide/libhdd-sched into json
implements permitted attributes as method
adds hdd_parser
implements basic setup for dynamic validations
updates docstrings, adds basic tests for Simulation