ccnl: remove energy mesurement code

This code causes some troubles with the heavy usage of hwtimer and
foating point operations.

Ref: https://github.com/RIOT-OS/RIOT/issues/495
Merge pull request #511 from mehlis/ccn-lite-follow-up-7

ccnl: remove energy mesurement code
document PROJDEPS usage in dist Makefile
Merge pull request #512 from LudwigOrtmann/dist_makefile_projdep

document PROJDEPS usage in dist Makefile