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
sys/shell: fix error when not using sixlowpan

```
/sys/shell/commands/sc_net_if.c:631:27: error: ‘IPV6_MAX_ADDR_STR_LEN’ undeclared (first use in this function)
             char addr_str[IPV6_MAX_ADDR_STR_LEN];
                           ^
```
make: model net_if dependency on net_help
make: replace spaces with tabs in Makefile.dep
Merge pull request #1401 from LudwigOrtmann/scnetif_error

sys/net_if, make: fixup
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
cbor: CBOR implementation for RIOT-OS

This is a malloc-free implementation of the Concise Binary Object
Representation (CBOR) data format for the RIOT-OS.

This implementation mostly stand-alone, and it should be pretty easy to
port to other platforms. We're only using the C STL and some custom
network-related functionaliy which could be easily replaced by depending
on arpa/inet.h.

The CBOR API is straight-forward to use and provides encoding/decoding
functionality for all major C types, such as:
- int
- uint64_t
- int64_t
- float
- double
- char*
- struct tm
- time_t

It is possible to conditionally compile this module via CFLAGS:
- CBOR_NO_CTIME: All ctime related features removed
- CBOR_NO_FLOAT: All floating-point related features removed
- CBOR_NO_PRINT: All features depending on printf removed