add builder for schema object
add builderand refister static methods for Schema. add recursive clone, clean, add schema methods
remove old schema builder
add schema clone and nested schema adding
add cosmethic changes. add jsdoc for all methods of Schema class
add tests for clone, nested schema adding
add validator for schema class
add docs for verifier
add unexpected keys validation
add simple tests. clean test file
change lib structure
Merge remote-tracking branch 'origin/schema-object'