Added HttpKernel with routing and error handling events.
Added dependency injection component.
Merge pull request #7 from Claud1a33/master

Control compartir libro
Funcionamiento de SaveBook
Merge remote-tracking branch 'upstream/master'
Merge pull request #8 from enriquehf/master

Change for SaveBook
Implemented controllers with classes instead of functions.
Merge branch 'http_kernel'
Removed render_template function. Updated composer 'files' value.
Added dependency injection configuration.