Add testcase to Magic8ParserIsValidCommandTest: "add homework"
Fix Magic8Parser: invalid command for "add <a string>"
Fix Magic8UITerminal: freeze when command is invalid
Merge branch 'master' of https://github.com/cs2103aug2014-t15-4j/main.git
fix(Magic8Task): Issue #69
fix(Magic8Task): fix NullPointerException when instantiating a
Magic8Task with null deadline