pkg: ccn-lite: always rebuild

rpl: fix netapi commands handling

shell: fixed ncache arguments parsing

gitignore: add ccn-lite

2015.12: added release notes

travis: pass the proper branch to compile_test.py

tests: swap thread priorities in msg_snd_rcv test

travis: upgrade to trusty (beta)

posix socket: align size of sa_family_t with Linux

c3f7925c was the wrong fix for the described problem. The replying thread 2 needs a higher priority because otherwise the sender thread 1 may send before 2 is in receiving mode again.

cpu: native: fix native timer_set_absolute()

gnrc_pktbuf_static.c: fix overflow in gnrc_pktbuf_realloc_data

fixes #4611 by always re-building the ccn-lite library

tests:xtimer_hang: use THREAD_STACKSIZE_DEFAULT instead of literal.

tests: allow language extensions for fault_handler test in clang

This patch fixes overflow, which is caused by
(pkt->size - aligned_size). This happens if pkt->size and
new size are unaligned and the difference
between pkt->size and new size is less than four.

tests: remove vtimer tests

Linux defines `sa_family_t` as `unsigned short int`. In order to be compatible with Linux code, RIOT should define it the same way.

drivers/kw2xrf/kw2xrf.c: fix MAX_PKT_LENGTH

fixes several bugs on GNRC network stack

When ENABLE_DEBUG is 1, `out` is dereferenced unconditionally, but
`_parse_options` in `gnrc_rpl_control_messages.c` calls it with NULL.

Clarified `out` must not NULL and fixed `_parse_options`.

When `gnrc_ndp_node_next_hop_l2addr` cannot resolve L2 address, it creates a
temporary neighbor cache entry with interface `KERNEL_PID_UNDEF` (unless the
interface is already known) to send a neighbor solicitation. When another packet
directed to the same address is going to sent before receiving a neighbor
advertisement, `gnrc_sixlowpan_nd_next_hop_l2addr` gets the temporary neighbor
cache entry and calls `gnrc_ipv6_netif_get` with `KERNEL_PID_UNDEF`, resulting
get a `NULL`. We must check `NULL` before dereference it.

FYI, both `gnrc_ndp_node_next_hop_l2addr` and
`gnrc_sixlowpan_nd_next_hop_l2addr` are enabled when
`gnrc_sixlowpan_border_router_default` module is enabled with `GNRC_NETIF_NUMOF`
is greater than 1:

gnrc_sixlowpan_border_router_default
→ gnrc_ipv6_router_default
→ gnrc_ndp_router (if GNRC_NETIF_NUMOF > 1)
→ gnrc_ndp_node
→ gnrc_ndp_node_next_hop_l2addr is called from _next_hop_l2addr

gnrc_sixlowpan_border_router_default
→ gnrc_sixlowpan_nd_border_router
→ gnrc_sixlowpan_nd_router
→ gnrc_sixlowpan_nd
→ gnrc_sixlowpan_nd_next_hop_l2addr is called from _next_hop_l2addr

This patch fixes MAX_PKT_LENGTH on kw2x radio

This reverts commit ec441e9a.

tests: fix clang missing field error