Fixed wrong prim type in registry
Fixed wrong prim column name (count) for ping
sketch of a web-based client interface
Merge pull request #16 from MKV21/develop

Fixed some problems with ping.py
update protocol-spec.md
Merge branch 'develop' of https://github.com/fp7mplane/protocol-ri into develop
deintegrate Schedule, integrate Registry. Tests fail, obviously.
proposed fixes for issues #12 #14
typofixes to previous commits; fix #13
Added repeated when to When object
Added datetime_iterator for specification