Fixes and added support for attributes of links

	* Initialization of attributes with bold font and blue color
	* Applyed attributes when new link added
	* Added example to LinksViewController
New public and private methods and changes on behaviour of addLink

	* Changed method addLink:withText to search all the text in the label text. All this instances will have the same link but detected in different positions
	* Added method to add link to part of text in a range of the label text
	* Some logs removed
	* Example of new methods working on LinksViewController