native: add help option

Closes: #840
ccnl: find bogus looping content
Merge pull request #1035 from LudwigOrtmann/issue_840

native: add help option
Merge pull request #1036 from mehlis/ccnl-looping-content

ccnl: find bogus looping content
Add argument to thread_create
Add argument to thread_create for native
Add argument to thread_create for ARM
Add argument to thread_create for msp430-common