fix calc_rtt

closes #192
Merge pull request #598 from LudwigOrtmann/ping_rtt

fix calc_rtt
update native readme
fix paths in README.md
Merge pull request #600 from LudwigOrtmann/native_readme

update native readme
Merge pull request #599 from LudwigOrtmann/readme_md

fix paths in README.md
remove native cruft from cc110x_ng Makefile
Merge pull request #602 from LudwigOrtmann/cc110x_cruft

remove native cruft from cc110x_ng Makefile
Fix net_help include path
Merge pull request #603 from authmillenon/net_help_include

Fix net_help include path
added @author fields

authors found in:
https://github.com/RIOT-OS/RIOT/commits/master/core/cib.c
http://ukleos.org/projects/ukleos/repository/revisions/master/changes/core/cib.c
Merge pull request #593 from mehlis/cib-license

cib.c: added @author fields