BUILD_WINDOWS.TXT, BUILD_UNIX.TXT removed from root folder
src/BUILD_WINDOWS.TXT, src/BUILD_UNIX.TXT converted to "md"
BUILD_WINDOWS.TXT, BUILD_UNIX.TXT are now hyperlinks in README.md
* Reformat README. Add compile requirements
* Expand the list of required packages for a successful compilation
* Renamed README to README.md (Default name in github)