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.
core/dev/led: Allow platform to provide LED color map
[ci] Remove pointless `$MAKE_TARGETS` -

1. there was an odd error when this environment variable wasn't set
    (`[: =: unary operator expected`)
2. this environment variable is not used anywhere else

Removing it makes the logic look much simpler - do make `cooja.jar`
if build type is any other then `compile`.
Merge pull request #186 from errordeveloper/remove_make_targets_env_var_for_travis

[ci] Remove pointless `$MAKE_TARGETS`
Merge pull request #281 from pabigot/feature/platform-led-override

core/dev/led: Allow platform to provide LED color map
Merge pull request #276 from mkovatsc/er-coap-13

Erbium (Er) fixes and updates
first implementation for tlc59116 on z1
working tlc59116 implementation for z1
tlc59116 for zolertia, added 0 values at init and code clean-up
added tlc59116 datasheet url
contiki code style changes and copyright update + added source to ARCH instead of SOURCEFILES in platform Makefile
Corrected copyright holder.