Initiaded microposts testing

Added relations users->microposts and microposts->user
Spec for user modificated to verify it has microposts metho
Spec for microposts created and initiated
About to show microposts in User's show action
Added microposts styling. Changed root_path for signed in user
Microposts advances
Changed the error_message partial to work with any model by passing an generic object
Home page modified to include micropost posting
Finishing microposts insertion and deletion. Trying to set counter on microposts box
Setted a characters countdown for microposts and word wrap too