#73 String constructor to support JAX-RS

[Pat]

According to the JAX-RS specification (Chapter 3.2 Fields and Bean Properties):
Valid parameter types for each of the above annotations are listed in the corresponding Javadoc, however in
general (excluding @Context) the following types are supported:

1. Primitive types.
2. Types that have a constructor that accepts a single String argument.
3. Types that have a static method named valueOf or fromString with a single String argument
   that return an instance of the type. If both methods are present then valueOf MUST be used unless
   the type is an enum in which case fromStringMUST be used.
4. List<t>, Set<t>, or SortedSet<t>, where T satisfies 2 or 3 above.</t></t></t>

Unfortunately, the Joda DateTime(Object) constructor does not satisfy this requirement, so we cannot have Joda DateTime query parameters in our RESTful services.

Suggested Fix:
Overload DateTime constructor with DateTime(String)

JAX-RS Spec available here:
http://download.oracle.com/otndocs/jcp/jaxrs-1.1-mrel-eval-oth-JSpec/

[Stephen Colebourne]

Joda-Time v2.0 now has a parse(String) factory. Hopefully a future revision of JAX-RS will utilise that naming pattern, or something like Joda-Convert. In the meantime, you'll need to write a plugin to your JAX-RS provider.