* Created the CalendarUtils class with methods for setting CheckIn and
CheckOut dates.

* Created the HomePageHelper class, containing a method for verifying
that the user is on the home page.

* Created the SearchErrorPageHelper class, containing a method for
verifying that the error received by a user when performing an invalid
search.

* Created the SearchPageTests class, containing 13 test cases.

* Created the SearchPageHelper class, containing methods for setting
Location, number of rooms, number of adults, number of children,
children ages, clicking the Search button, and for verifying the empty
destination error field.

* Added error messages for empty location message and for invalid
location message.

* Added Keys for Search Page elements and for invalid location error
field.