fix ignore command
amendment to 169976f
shell: transceiver: added missing return in error case
ccnl: remove dead code
Merge pull request #874 from OlegHahm/fix_ignore_command

net: transceiver: fix ignore command
Update README.md
Merge pull request #937 from mehlis/ccnl-dead-code

ccnl: remove dead code
Merge pull request #941 from LudwigOrtmann/native_invocation

Update README.md
Proper rb_add_elements() implementation
Add documentation for ringbuffer
Remove old comments from ringbuffer.c