Merge branch 'master' into interface
Changed classpath and added ANTLR lib

To support natural language parsing of dates from user.
Merge branch 'quality_control'
Merge branch 'quality_control'
Merge branch 'master' into interface

Conflicts:
	.classpath
Integrated mark command and NLP for date parsing

- Mark is now an acceptable CommandType and parsed.
- Natural language for date is supported for parsing
Merge branch 'master' into interface
Merge branch 'interface'
Update README.md

Provided basic product description, support commands and expected
output format.
Merge branch 'interface'