add option to specify a proxied path prefix
add option to specify a proxied path prefix

peterneubauer/riemann-tools,shanielh/riemann-tools,nandudheeraj/riemann-tools,riemann/riemann-tools,riemann/riemann-tools,krakatoa/riemann-tools,aphyr/riemann-tools,uswitch/riemann-tools,pepoirot/riemann-tools,hybris/riemann-tools