Various fixes and improvements for non-Windows systems.

[maximumspatium]

Summary:

• Makefile: 'main.c' has been corrected to 'main.cpp'
• Makefile: -std=c++11 need to be explicitly added to the compilation options to work with GCC 4.x
• Using "&&" where bitwise AND is required triggers compilation warnings when compiling with non-M$oft compilers. Fixed by the proper replacement.