unittests: support Makefile.include in test suites

This change will pull in the `Makefile.include` for every test suite
that is compiled in.

Fixes #1205.
s/PROJECT/APPLICATION/g

fixes #548
Merge pull request #1224 from thomaseichinger/pro-to-app

make: s/PROJECT/APPLICATION/g
Documentation: Create README.md for the CCN-lite client and relay
Merge pull request #1227 from emmanuelsearch/CCN-documentation

CCN documentation
Merge pull request #1207 from Kijewski/unittests-makefile.include

unittests: support Makefile.include in test suites
Fix trailing whitespaces

Fixes #1138
Merge pull request #1163 from authmillenon/fix-whitespaces

Fix trailing whitespaces
Initial commit of Arduino Mega2560
strip functions in atmega2560/periph and atmega_common/thread_arch.c down to prototypes

Add custom errno.h since avr-libc doesn't include one
rename board_init to main, main to o_main (inside hello-world/main.c). Fix
Makefile.include:

UART works within RIOT codebase, :)