add the default wrapper for sha256
removed unmaintained code for LPC214x MCU
removed unmaintained logd library
removed unmaintained syslog library
removed unmaintained tracelog library
removed unmaintained micro mesh routing code
Merge pull request #124 from mehlis/sha256

add the default wrapper for sha256
Merge pull request #108 from OlegHahm/unmaintained_libs

removed unmaintained code
change python shebang to python2 -> python is mostly python3
Merge pull request #128 from mehlis/master

change python shebang to python2 -> python is mostly python3
Implement simple echo request/reply
Set up new directory structure
Move error codes to public includes
Make sixlowpan module more coding conventions compliant
Add documentation group for 6LoWPAN module
Update documentation of ipv6.h
Make usage of IPHC configurable.
added callback registration for sixlowip
added callback for sixlowpan
Refactor mac.h