rooms 7.x-1.5

Issue #2418581 by rbredereck: Display unit name in place of availability state label

Issue #2424375 by plopesc: Allow to modify calculated room price via hooks
Allows other modules to modify the booking price before price modifiers are applied to it. This is useful if modulers want to use price modifiers that can take into account booking parameters (e.g. special offers for specific dates) but the initial price calculation differs from the standard Rooms pricing calendar. Please see example in rooms_pricing.api.info

Issue #2423537 by Ambidex: Misleading information in admin/reports/status about installed libraries

Added hook documentation in api.php files

Calendar events are restyled and color choices updated:
**PLEASE REVIEW FRONT-END THEMES** Calendar color choices can be set through variables or the the Rooms configuration page so please review that the updates do not clash with your theming choices - especially for the front-end.

Issue #2442841 by yalu: An illegal choice has been detected. Please contact the site administrator. when submitting "add a bookable unit type" form.

Code in rooms_booking_manager_enquiry_page_form cleaned up to improve readability

Added rooms_string_alter hook that allows for modules (in certain cases) to intervene so as to modify (based on the pre-existing booking information) what is shown to a user.

Issue #2445673 by GiorgosK: specify date module dependencies.

Issue #1490818 by bones, Marvine: document requirement for PHP 5.3.9 or greater.

Fixed issue with price re-calculation following the choice of options when price modifiers where involved.

Fixed issue with translation of Rooms terminology when used in hook_menu titles.