fixed missing include
Merge pull request #40 from BytesGalore/master

Fix for missing include in the native cpu
Link with -lrt if glibc < 2.17 for native on linux
fix ucontext.h include for OSX, FreeBSD
fix signal handler, ringbuffer for native FreeBSD
* function to check for enabled interrupts on ARM
* added TODO comment
Merge branch 'master' of github.com:RIOT-OS/RIOT
clarify: while loop without body is correct here
prevent double include of debug.h
main should always return int

this fixes some compiler warnings
Merge pull request #46 from mehlis/master

fix some more compiler warnings found by clang
* changed transceiver_type_t to bit field

 (fixing #47)
* cast main function in kernel_init to match prototype
fix warnings due to unapropriate prototypes
fix ICMP type is DIS
Merge remote-tracking branch 'origin/sixlowpan_fixes'
Merge github.com:RIOT-OS/RIOT