Adding a Version asserter, to compare software version strings 'ala php'.
Merge pull request #3 from shouze/feature/version-asserter

Adding a Version asserter, to compare software version strings 'ala php'.
Added version asserter as a service.
Merge pull request #4 from shouze/feature/version-asserter-service

Added version asserter as a service.
Update readme.
Merging 2.0
Update readme.
Fix typo in composer.json
Use property access to read properties(method/array) from a source.