sys/vtimer: spin on short duration in vtimer_sleep

closes #571
board/flash: changing flashrom_write signature

	→ changing all flashrom_write() function to the same signature
	→ adding const keyword to signature
dist/pyterm: enable unicode decoding

use unicode streamreader on serial interface
fixes #1371
tests,examples: remove unneeded headers, fix style
pkg/libcoap: fix copmilation problems

Apparently all that whitespace was needed after all.
Next convert to new-style function declrations.
Also, don't prevent make from noticing a failing patch.
tests: add libcoap compilation test
Merge pull request #1347 from SGSSGene/cleanup_signature_fix

unification of flash write signature
Merge pull request #1429 from LudwigOrtmann/libcoap-fixup

pkg/libcoap: fix build AND tests: add one to ensure it does not break in the future
Merge pull request #1381 from LudwigOrtmann/issue-1371

dist/pyterm: enable unicode decoding
Merge pull request #1430 from LudwigOrtmann/test-cleaning

tests,examples: remove unneeded headers, fix style
board: Initial import of stm32f0discovery
cpu: Initial import of cortex-m0_common
cpu: Initial import of stm32f0
tests/examples: added stm32f0discovery to ignorelists
Merge pull request #1291 from haukepetersen/board_stm32f0discovery

Board stm32f0discovery
shell: prepare a rudimentary IEEE 802.15.4 packet

The transceiver module expects an `ieee802154_packet_t` instead of a
`radio_packet_t` if the device supports the IEEE 802.15.4 packet format.
This commit fixes the corresponding transceiver shell command for
`txtsnd` to set destination address (short address mode), payload, and
length accordingly.
Merge pull request #1434 from OlegHahm/fix_txtsnd_ieee802.15.4

shell: prepare a rudimentary IEEE 802.15.4 packet
board: Initial import of stm32f4discovery
cpu: Initial import of stm32f4
cpu: Initial import of cortex-m4_common