Update to have gitignore
Merge branch 'master' of github.com:contiki-os/contiki
Merge branch 'master' of github.com:contiki-os/contiki
Fixes warnings, bad code and code style
Use the Z1 product ID as MAC/Node ID if no value is found in the XMEM
Merge pull request #824 from alignan/fix_warnings

Warning fixes
Merge pull request #820 from alignan/serialnum_as_nodeid

Use the Z1 product ID as MAC/Node ID if no value is found in XMEM
Merge branch 'master' of github:sieben/contiki
fix
Fix useless semicolon
Merge branch 'semicolon' of github:sieben/contiki into semicolon