Some syntax fixes

- I've updated the syntax of the SugarRecordObjectProtocol. It's now:
```swift
    /**
    *  Returns a SugarRecord finder passing a predicate
    */
    class func by(#predicate: NSPredicate) -> SugarRecordFinder
    
    /**
    *  Returns a SugarRecord finder passing a predicate in String format
    */
    class func by(#predicateString: NSString) -> SugarRecordFinder
    
    /**
    *  Returns a SugarRecord finder passing a predicate in a value-key format
    */
    class func by(#key: String, equalTo value: String) -> SugarRecordFinder
```