net: introduced ng_netbase pseudo module and header

net/ng_netdev: added error code to send()

examples: rpl_udp: initialize state variable

More documentation cleanups

rpl: make send_DAO aware of multiple dodags

rpl: make send_DIO aware of multiple dodags

boards/nucleo-f334: adjusted openocd config

boards/arduino-due: revert bossac binary

cpu/nrf51822: added SPI driver

make: made consistent use of spaces in Makefile.dep

rpl: pass rpl_instance_t directly instead of its id

sixlowpan: Broadcast message when neighbour not found in cache.

rpl: use global ip addresses instead of link-local ones

rpl: remove call to rpl_get_my_preferred_parent() in rpl_send_DAO, because of dependency to rpl_get_my_dodag()

at86rf231: at86rf231_set_address_long bugfix

Core: doc: add note advising against creation of threads from within ISR

added SPI defines for
- yunjia-nrf51822
- pca10005
- airfy-beacon

boards: added support for ST nucleo-f091

dist/tools/whitespacecheck: Do not redirect stdout.

The old code was never working, all of the middle address bytes were set
to 0x00 because of the bitwise AND being executed after the right shift.

Show new whitespace errors in Travis log for easier code review.

ng_netif: cleanup array after remove

shell: port ifconfig for ng_netif

boards: fix flashing of arduino-due and spark-core

The file was accidentally changed in 23626234

ng_net: changed semantic of get and set command slightly