Build notes

//-------------------------------------------------
// Linux
//-------------------------------------------------
To build, run
make

To enable logging, ensure that 
-D TB_LOG 
is set in the compiler flags

//-------------------------------------------------
// Android
//-------------------------------------------------
To enable logging for Android, TB_LOG should be defined in the ./jni/Android.mk file as

LOCAL_CFLAGS := -DTB_LOG

//-------------------------------------------------
// Arduino
//-------------------------------------------------
To enable the logger for Arduino, TB_LOG should be defined in 
Properties|C/C++ Build|Settings|Tool Settings|AVR Compiler|Symbols
and
Properties|C/C++ Build|Settings|Tool Settings|AVR C++ Compiler|Symbols

Note: when building for Arduino, force the compiler to use avr-g++ to build logger.c.  Or rename logger.c to logger.cpp.

Note: when building for Arduino, several warnings are generated when trying to place strings in
PROGMEM
"warning: only initialized variables can be placed into program memory area"
This appears to be a known gcc bug - https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34734