[base] TokenShaper: inherit timeout handler
added the ability to just run `make test` in order to run the tests.
[plugins] director: drop standby-role due to future changes rolling in.
be a little more greedy in time diff testing.

even on my laptop the test sometimes failed, possibly due to other tasks
running.
test time diff at last, since it's the most sensible one. ;)
some README updates wrt. Clang support
[base] TokenShaper: added missing namespace
[base] TokenShaper: do only propagate recomputing token capacities when the root node's capacity actually changed.
[base] JsonWriter: added support for serializing floating point values
[base] TokenShaper: added support for dropped-statistics
[base] TokenShaper: minor code cleanup
[base] TokenShaper: some API documentation :)
[base] TokenShaper: added JsonWriter << operator
[plugins] director: removed some obsolete files
[base] CustomDataMgr: added explicit clearCustomData(key)
[plugins] director: added initial HTB-like queuing discipline support.

support.
flow.vim: adapted to director plugin changes
[plugins] director: working around "private member not used" Clang compiler warning
[plugins] director: added missing content-type response header to haproxy?monitor stats
[plugins] director: fixed bug in CSV output only showing pxname on first backend.