fixed bug in facet-chiclet selection

facet selections preceded by parenthesis in a query were not being identified.
This new dynamic regex matches the beginning of a line OR (a space OR open parenthesis)
followed by the facet name.
Merge pull request #157 from joemfb/facet-selection-fix

fixed bug in facet-chiclet selection
contribution from damianfabian: Make a parameter's filename available
Merge branch 'dev' of https://github.com/marklogic/roxy.git into dev