Changes

Tsk36 Adds the creation of microstories to the personal page
Creates a new story constructor used for the creation of a new story in
the personal page. Adds a new modal that makes use of a javascript file
that controls the maximum size of the text based on the value of the
genre. Modifies the template in order to use the javascript file. Adds a
new button in the userPage to open the modal. Modifies the controller of
story to use the method of create story.