Enable Type selector; Update logic to take type into account

• Update install to check for active "url" or "path" purger
• Update documentation to illustrate path vs url type selection
• Update logic to account for type setting. If 'url,' keep logic as is. If 'path,' use a relative URL stripping the initial '/' character
• Keep wildcard logic as is
• Update log / debug messaging to correctly show type selected and path/url being invalidated.