Add runtime properties to all distributions.
Replace karaf specific system properties with generic ones for all containers. Add runtime specific runtime properties services. Add wildfly container registration.
#1908 add some default icons to use for profiles
#1908 add an "iconURL" property to profiles to return the relative URI (from the Fabric8 REST API) of the icon for the profile
#1908 add a "summaryMarkdown" property to profiles so its easier to view the summary text of profiles (and provide a default value if there is not a Summary.md available but there is a ReadMe.md)
fix typo
#1908 polished the markdown to trim heading formatting and fixed up the iconURL
#1908 add overlay implementation to avoid exception in hawtio
#1908 fix up some mime types, particularly for icons