data analysis notebook, moved tres module
fixed initial data bug, updated README
tasks:
- test on delay before coap tx
- rd server max retries inf.
- new logging elements
- new way to find if a node has been reset

rd.c
- new output string (keepalive count)

rest models
- fized caching
- removed Celery timeouts
- restored libcoap client timeouts

web interface improvements

- contiki app common conf
define for wismote id

er-example-server.c
- announce lifetime to rd server
- minor fixes (resource titles)
. periodic light sensor