model update

Word, Record has already implemented and tested.
Dictionary, Dictionaries has already implemented and not tested yet.
The next step is to implement DictionaryImpl.
Merge branch 'ArielQian' into verion1.0

Conflicts:
	.classpath
Merge branch 'verion1.0' of https://github.com/FudanSoftwareCCWI/Lab4 into verion1.0