travis: fix git complaining about 'ambiguous argument'

core: fixed include guards a minor style/doxygen

rpl: shell: only print the first 32 bits of the trickle intervals

gnrc: remove dot from name

gnrc_pkt: Packets => Packet

arduino: minor doc fix

rpl: shell: do not use PRIu64

Add and configure Vagrant for RIOT-OS

gnrc netif: add a check for interface existence

examples: add microcoap, gnrc, conn example

stm32l1/i2c.c: adapt for new i2c periph driver interface

git: handle patch files as binary

ping6: dedicated message at address parsing error

Allow project to override servo frequency/resolution settings

Initial TFTP support

Fix: packet size and typo in transfer mode main -> mail

CI: split up Cortex-M4 in two groups

examples/default: remove trailing whitespaces

This is mandatory on platforms where both settings are strongly tied (eg. lm4f120)

gitignore: ignore package directories

Fix UDP/ICMPv6 checksum for a sliced/accumulated payload.

drivers/at86rf2xx: don't inlcude the header in itselfs

net/gnrc/ipv6: de-inlined ipv6_addr_equal