Updated Gemfile from 2.2.8 to 3.1.1
Modified modal initial public screen
Navbar fix

Conflicts:
	app/views/layouts/application.html.erb
Btn-mini to btn-xs fix
Navbar alumnos fixed
Usuarios btn-xs fixed
Fixed JS element param call
Responsive Styles for Tareas
Migrated view to Bootstrap 3
Tareas partial modified for responsive
Added Glyphicons fonts and fixed usuarios table
Glyphicons fonts
Alumnos list for selector
Added helper method for boolean icons
Added class button-load
Layout Alumno fixed for Bootstrap 3
Bootstrap 3 button fixes in Proyectos
Removed old flow in tmp_proyectos form
Usuarios administration view improved
Deleted spaces