use mutex in vtimer_sleep

this change prevents a race condition in case of
short sleep time

Fixes: https://github.com/RIOT-OS/RIOT/issues/550
added the missing define for radio_packet_length_t on econotag
timex.c: add copyright header
tests: use astyle to adopt current code style guide
Merge pull request #551 from mehlis/vtimer-mutex

use mutex in vtimer_sleep
Allow Mac linebreaks in shell

QEMU uses Mac style newlines in its UART implementation.
This change allows Unix ("\n"), DOS ("\r\n") and Mac ("\r") style
linebreaks.
use one consistent mail address in all places
Merge pull request #573 from mehlis/mail-address

use one consistent mail address in all places
update Kaspar's email address

kaspar.schleiser@fu-berlin.de is obsolete.
(2nd try, first try was overwritten by some overzealous documenter)
Merge pull request #561 from mehlis/copyright

timex.c: add copyright header
Merge pull request #565 from Kijewski/shell-mac-nl

Allow Mac linebreaks in shell
fix libcoap checkout target

Fixes the following error:
make[1]: Entering directory '/foo/RIOT/pkg/libcoap'
git clone http://git.code.sf.net/p/libcoap/code /foo/RIOT/pkg/libcoap/libcoap && \
	cd /foo/RIOT/pkg/libcoap/libcoap && git checkout 89acaa6775ca3a4aedea510557e6b9c0c01fa5db
fatal: destination path '/foo/RIOT/pkg/libcoap/libcoap' already exists and is not an empty directory.
Makefile:25: recipe for target '/foo/RIOT/pkg/libcoap/libcoap' failed
add .gitignore for openwsn pkg
Merge pull request #580 from LudwigOrtmann/openwsn_gitignore

add .gitignore for openwsn pkg
Merge pull request #552 from OlegHahm/radio_packet_length_t_for_econotag

added the missing define for radio_packet_length_t on econotag
Merge pull request #574 from kaspar030/kaspar_email_change_2

update Kaspar's email address
Merge pull request #567 from mehlis/tests-astyle

tests: use astyle to adopt current code style guide
examples: use astyle to adopt current code style guide
fix call to err()
Merge pull request #566 from mehlis/examples-astyle

examples: use astyle to adopt current code style guide