Changes

tsk71 Adds auxiliary date formatter
Adds a new auxiliary class to formatting dates coming through the URL as
text before giving them to lower layers of the application. This new
class could be injected on REST resources to get the functionalities. It
has two methods for parsing dates, one returning it as a Date object
with the time setted at the starting time of the day, 00:00:00, and the
other with the time setted at the end of the day, 23:59:59. Once it's
integrated, the REST resources and their tests, are updated to make use
of this new utilities.