Drop database button.
[fix] add option when auth db is a single database for the user (mongolab for example)
[fix] #91 : NPE in the MongoRunconfiguration when server are not connected
[upd] Explorer: when double-clicking on a server, it loads its databases
Merge branch 'master' of https://github.com/piddubnyi/mongo4idea into piddubnyi-master
Merge branch 'piddubnyi-master' into update
[upd] add confirmation dialog for drop database and drop collection