Added flags to enable 20-bit support from msp430-gcc 4.7.x
Merge pull request #637 from alignan/z1-add-flags-20bit-support

Added flags to enable 20-bit support from msp430-gcc 4.7.x
Merge branch 'master' of https://github.com/contiki-os/contiki into dev
Format Code
Merge branch 'refs/heads/dev' into dev_RPL

Conflicts:
	core/net/ipv6/uip-ds6-nbr.c