Contact Controller
Added update and delete books
Fix some notes
Fix notes in books updating
Renamed 2 variables
Mistakes Correction
Rename validate function in UsC
Merge pull request #20 from danilms/update_and_delete_books

Added update and delete books
removed Error suffix from input
Few changes in change contact form
Merge pull request #22 from Hantim/User

User Controller
Merge pull request #23 from Hantim/Contact

Contact Controller
Login Controller
Mistakes Correction
Merge pull request #21 from Hantim/Login

Login Controller
Add flash messages
Fix notes and refactor controllers
fix some notes
Merge pull request #24 from danilms/flash_messages

Add flash messages
Exceptions moved