added Textare for comments in booking
migration file for adding a field for comments
Merge remote-tracking branch 'origin/dev' into 25-additional_information

Conflicts:
	models/Booking.php
Related to story #25.
Added dynamic width of the comments field. It is now also shown, when viewing a booking.
Related to story #25.
Migration for comments field added.
Merge remote-tracking branch 'origin/dev' into dev

Conflicts:
	models/Booking.php
#25 - inserted rules for comment field in a new line
[#14] Introducing the update for TimeslotModels
add LoginLogout acceptance test
[#14] Added AccessControl for TimeslotModel
Added condition to avoid unwanted removals of booked Timeslots
Fixed wrong condition
(MIGRATION) [#11] Added 'blocking' field to Timeslot
(MIGRATION) [#11] Added 'blocking' field to TimeslotModel
add control on bookin reservation
Added different index for logged in users
(MIGRATION) token in booking table
Improvement security in booking delete
Composer update
[#11] Added validation for the booking property