Add additional tests/profiling

Five different tests are now available:

Compilation of mbed-events with mbedmicro/mbed.
```
mbed compile --library -t GCC_ARM -m K64F
```

Runtime tests in TESTS/events/queue/main.cpp.

mbed add https://github.com/mbedmicro/mbed
mbed compile -t GCC_ARM -m K64F --source=. --source=TESTS/events/queue/
sudo pyocd-flashtool .build/K64F/GCC_ARM/*.bin
mbedhtrun --skip-flashing --skip-reset --port=/dev/ttyACM0:9600

Strict c99 pedantic compilation of events-c. This should help prevent issues such as #3.
```
CFLAGS='-pedantic -Werror' make -C events-c
```
Runtime tests in events-c/tests/tests.c.
```
make -C events-c test
```
Profiling in events-c/tests/prof.c (viewable in travis.ci). More info here.
```
make -C events-c prof
```

Every test is supported CI except for runtime tests for mbed-events due to hardware requirements.

ARMmbed / mbed-events

Add additional tests/profiling #4