periph: added a random-data driver interface
Merge pull request #939 from mehlis/random-driver

random: added a random driver interface
Merge pull request #1583 from Kijewski/issue-1399

core: SCHED_PRIO_LEVELS==16 for every board
tests: limit concurrency level

Some Travis CI machines have 32 CPUs. This sets our concurrency level to 33.
Travis CI kills our buildtest for obvious reasons.

This PR limits the concurrency level to 8 on Travis CI.
cpu/sam3x8e: added random number generator driver
boards/arduino-due: enabled RNG driver
test/periph_random: added test for RNG driver
Merge pull request #1572 from Kijewski/issue-1564

sys: remove lib/hashtable.c
Merge pull request #1593 from Kijewski/nproc-max

tests: limit concurrency level
unittests: do not use auto_init
Merge pull request #1294 from haukepetersen/add_arduinodue_rng_driver

cpu: Add random number generator driver for the SAM3X8E
core: clist is a cyclic list
core: clist without explicit thread

Right now the core component `clist` is a generic cyclic doubly-linked list.
In the core it is used in `tcb_t::rq_entry`.
Further it is used `net_if.c`.

This commit removes the member `clist_node_t::data` which stored the
pointer to the `tcb_t` instance of which the clist is already a member.
The needless member added `sizeof (int)` bytes to every instance of
`tcb_t`.

In `net_if.c` the clist was used in a type-punned way, so that the
change won't affect it.
Merge pull request #1431 from Kijewski/wget-for-everyone-woooohooooo

make: centralize wget/curl & unzip/7z feature test
examples: renamed rpl_udp header
examples: cleanup for rpl_udp

* removed unnecessary shell commands
* updated documentation
* Unified global default IP address
rpl: moved headers to sys/net/include
examples: don't advertise IPv6 prefix

Cleaning up the IPv6 address initialization and removed the addition of
an IPv6 prefix to advertise.
examples: use correct broadcast address when sending
fix low-level sending destination address