Updated Map Documentation

Updated the documentation for goweb.Map and goweb.MapController to list the allowed argument types for matcherFuncs.
Static Mapper Updates

goweb.MapStatic and goweb.MapStaticFile didn't match goweb.handlers.HttpHandler.MapStatic and goweb.handlers.HttpHandler.MapStaticFile after those definitions were changed to support MatcherFuncs.  This update makes the definitions
match and updates the documentation with a short paragraph about the optional MatcherFuncs arguments.
Merge pull request #35 from stretchr/matcherFunc-updates

goweb.Map MatcherFunc updates