Team1 v1.2

- changed internal javascripts in header.php and footer.php into external 
and relocated in the directory /js/
- changed config base url to 'http://localhost/myfirstrepo' to be able to load
javascripts   (ie. <script src='<?php echo base_url() ?>js/jquery.js'></script>)
- renamed management functions to appropriate conventions in book model
(ie. editBook -> edit_book)
- manage_view.php - changed horizontal form design into vertical design
- added validation attributes in input tags (pattern="<regex>")
- optimized implementations regarding management modules