Telnetd improvement: allow specifying a maximum silence time and kill the connection after that time. This is to avoid the telnet connection getting stuck forever if the connecting host reboots.
Added a number of default options for ContikiMAC, and allow them to be overridden with contiki-conf.h configuration options
Allow proactive probing interval to be configured
Allow platform makefiles to specify APPS to be used, by defining a PLATFORMAPPS variable.
Bugfix: when a CSMA callback is received, we should remove the packet
that was transmitted and not just the first packet that happens to be on
the output queue.
Fixed option header bug for large deltas.
Limited observe clock to 24 bits.
Updated buffer definition macro due to core changes.
Updated copyright information.
Updated Erbium (Er) examples and removed unsupported static routing module.
Fixed RPL configuration according to core changes.
Added CoAP ping support.
Fixed stimer issues due to core changes for older Erbium versions.
Fixed broken/unclear Ipv6 configuration with CFLAG.
Merge pull request #177 from adamdunkels/feature-config-improvements

Configurability updates
Temporarily disable large RPL network test until we get link-layer ACKs in Cooja
Merge pull request #257 from adamdunkels/hotfix-csma

CSMA bugfix
Makefile.include: support extending CLEAN with directories

Use recursive remove for $(CLEAN) to support applications that extended it
with directories that should be removed.
Makefile.include: support make clean all

Historically $(OBJECTDIR) was created when Makefile.include is read.  A
consequence is that combining "clean" with "all" (or any other build
target) results in an error because the clean removes the object
directory that is required to exist when building dependencies.
Creating $(OBJECTDIR) on-demand ensures it is present when needed.

Removed creation of $(OBJECTDIR) on initial read, and added an order-only
dependency forcing its creation all Makefile* rules where the target is
explicitly or implicitly in $(OBJECTDIR).
Merge pull request #279 from pabigot/push/make-clean-all

Add support for subdirectories in CLEAN and for "make clean all"