Added Dictionary lookup feature 

I added a simple dictionary lookup feature using the library and database from Yomichan.  Yomichan is GPL licensed which is compatible with AGPL.  Technically it would become AGPL as well, however, NOTHING was changed in the files from Yomichan.  This means you could rely on it's installation just by changing where it looks for data, however, I like having it as part of MCD for stability sake.