test_shell: fix includes

malloc.h is not needed, apply coding conventions to others
Merge pull request #823 from LudwigOrtmann/test_shell

test_shell: fix includes
redbee-econotag: fix Makefiles

remove empty unsused Makefile.dep
add board include path to INCLUDES
Merge pull request #825 from LudwigOrtmann/redbee-econotag_Makefiles

redbee-econotag: fix Makefiles