Added lean query support. Passport Local Api Key compatibility implemented.
Ignore keys option implemented.
Merge pull request #1 from unbornchikken/master

Ignore key + lean query support.

e.g.
'''
contentSchema.plugin(QueryPlugin, { ignoreKeys: "apikey" }); // will ignore ?...&apikey=blahblah
contentSchema.plugin(QueryPlugin, { ignoreKeys: true }); // will ignore all query keys which is not q,t,f,s,etc
'''