Implemented Log class with basic functionality

Updated makefile to specify C++11 in CFLAGS
Removed 'using namespace std' from all files
Implemented Log class with basic functionality (writing to specified file, quiet and verbose log levels, route log messages to console if file could not be opened)
0.3

Refactored Log class to be simpler and standalone
Updated debug messages to use Log
Added command line option '-v' to get verbose log