Add assosiations type to model generator

[stuk88]

Until now it was sails generate model Cart user:string And no way to pass assosiations.
Now you can put the assosiated object in array brackets and it generates model with assosiations.
New way:
sails generate model Cart user:[User]
and it will generate

user: {
model: 'user'
}

sails generate model Cart users:[User]
and it will generate

user: {
collection: 'user'
}

[stuk88]

dont know about the whitespace... need to test.

[stuk88]

Added support for one to one and many to many assosiation.