tests: fixed Makefile for test_ipc_pingpong
Merge pull request #1328 from haukepetersen/fix_test_ipcpingpong

tests: fixed Makefile for test_ipc_pingpong
make: %s/PROJECT/APPLICATION/g Part III
Merge pull request #1330 from LudwigOrtmann/projects_removal

make: %s/PROJECT/APPLICATION/g Part III
doc: fix comment indentation
tests: remove obsolete license pattern
doc: replace RIOT license header with default lgpl