cpu/nrf51822: fixed gpio driver
boards: added LED macro for pca1000 & yunjia-nrf
make: del no-delete-null-pointer-checks for clang++

This PR enables the use of clang++ to compile C++ projects by adding
`CXXUWFLAGS += -fno-delete-null-pointer-checks`, if `${CC}` understands
`-fno-delete-null-pointer-checks` but `${CXX}` does not.
core: Provide functions for different byte orders

Rationale: see #1586.
tests: Add unittests for byteorder.h
tests: fix bad copy+paste in tests-core.h
Notify about dropped packets

Added debug output that warns about packets that are dropped
because the transceiver buffer was full or because the transceiver
failed to notify aiting upper layers.
Merge pull request #1755 from Lotterleben/transceiver_debug_clean

transceiver: notify about dropped packets
board/iot-lab_M3: fixed default terminal device
Merge pull request #1760 from haukepetersen/fix_iotlab_term

board/iot-lab_M3: fixed default terminal device
redbee-econotag: don't print noisy warning
make: Centralize color use
make: add Makefile.features telling the BOARDs' features

Please see #1715.
Closes #1715.

This PR implements the new Makefile variables "FEATURES_PROVIDED" and
"FEATURES_REQUIRED". A board *can* have a new file `Makefile.features`
which looks like:

```make
FEATURES_PROVIDED = transceiver
```

An application can have a corresponding line

```make
FEATURES_REQUIRED = transceiver
```

If the selected BOARD does not fulfil the requirements of the
application, then a *warning* is issued at compile time.

This change only includes the feature "transceiver", further features
are expected to be listed in further PRs. The requirement "transceiver"
is automatically added if the application uses the module
"defaulttransceiver".

`make buildtest` understands the new feature listing, so the user won't
need to add boards to `BOARD_BLACKLIST` manually.

Part of the change are the added Make targets
* `info-features-missing`, which prints the required features
  `\setminus` the provided features. The output is empty if there are no
  features missing.
* `info-boards-features-missing`, the same as `info-features-missing`
  but as a table for all boards, but heeded `BOARD_WHITELIST` and
  `BOARD_BLACKLIST`.

Applications don't have to use this new feature. This change does not
break existing Makefile.
Merge pull request #1734 from Kijewski/issue-1715

make: add Makefile.features telling the BOARDs' features
make: add gpio feature
tests/driver_pir: set default GPIO
Merge pull request #1765 from LudwigOrtmann/feature_gpio

make: add gpio feature
Copy some files from cpu/sam3x8e to cpu/cc2538.
Add the latest cc2538-bsl script from https://github.com/JelmerT/cc2538-bsl/commit/f3701a0
Fix oonf_api after destiny to socket_base migration

The include path provided for socket.h did not exist.