passport-local suggestion

[ianhead88]

i needed to recode this for email/password authentication instead of username/password. doing so was pretty straightforward, except for a some indexing collision error. the fix was to remove the index on "username." to do so, i followed mongoosejs official documentation, where they recommend disabling auto index anyway. some people may like it, but it just caused a like of headaches/debugging for me.

MongooseJS documentation says:

animalSchema.set('autoIndex', false);
// or
new Schema({..}, { autoIndex: false });