DDF-181: updated ContentDirectoryMonitor to only start/stop its own routes vs. all routes in bundle's camel context, and it now handles system restarts
DDF-136: added comments about why DERIVE RRD data source type preferred over COUNTER
DDF-163: fixed mime-core-app features.xml file's customMimeTypes lines that were
DDF-181: added comment about ModelCamelContext interface usage; cleaned up unit tests to use Apache FileUtils and better teardown logic