Add search method to sardine

Create an HttpSearch method implementation, and a search
method in sardine.  Take the url, language, and query
string as parameters.

Add searchrequest to webdav.xsd, create a SearchRequest object
to facilitate JAXB marshalling.  Reformat using tabs.
Merge branch 'addsearch' of github.com:gwcary/sardine into addsearch

Conflicts:
	src/main/java/com/github/sardine/impl/SardineImpl.java