Added CUFTS support in ResolverResolver

Added CUFTS support in ResolverResolver

This is based on the CUFTS implementation for UPEI. This is
very closely modeled on the SFX implementation.

opensrf.xml.example has been modified to include a <resolver_type>
element for ResolverResolver; by default, SFX will be used and this
shouldn't break anything else. If you use CUFTS rather than SFX, you
can specify 'cufts'.

Signed-off-by: Art Rhyno <artrhyno@uwindsor.ca>
Signed-off-by: Dan Scott <dscott@laurentian.ca>