cpu: msp430: renamed msp430x16x to msp430fxyz
cpu: lpc2387: integrated lpc_common into lpc2387

Rationale 1: The common part made only sense for (some) NXP ARM7 MCUs,
but was misleading for MCUs like the LPC1768.

Rationale 2: The common part was only used by one specific MCU
implementation - no need to outsource it.
sys: rename lib to hash_string

That was the onyl remaining module in this folder.
netdev: Fix netdev/default.h
Merge pull request #2152 from authmillenon/netdev-default-fix

netdev: Fix netdev/default.h
tests/unittests: merge lib-ringbuffer into core

Fixup for https://github.com/RIOT-OS/RIOT/pull/2017
Merge pull request #2151 from OlegHahm/lib_hash_string

sys: rename lib to hash_string
Merge pull request #2118 from OlegHahm/simplify_cpu_folder_structure

cpu: simplify folder structure
doc: fix drivers/srf02 documentation
doc: fix drivers/srf08 documentation
Merge pull request #2160 from PeterKietzmann/fix_srf_ultrasonic_doxy_warnings

doc: doxygen fix srf02/srf08 ultrasonic warnings
Merge pull request #2157 from LudwigOrtmann/unittests-lib

tests/unittests: merge lib-ringbuffer into core
netdev: Introduce setter for event handler thread
cc2420: Port for netdev.802154
[SQUASH ME] cc2420: address comments
[SQUASH ME] cc2420: adapt for netdev event handler