Resource definitions should be able to proxy DS methods

[jmdobry]

How it works now:

DS.defineResource('user');

DS.find('user', 5);
DS.findAll('user', {...});
// etc

How it will work:

var User = DS.defineResource('user');

User.find(5); 
DS.find('user', 5); // works same as above

User.findAll({...});
DS.findAll('user', {...}); // works same as above

// etc

[jmdobry]

See #93

[jmdobry]

Available as of 0.10.1.