Buffer support and Better file mgnmt in the CLI util

DESCRIPTION:
- Added buffer support in the binding file
- Better file management in the CLI util
- Updated the CLI to use Buffer
- Added a test case to show the same string in buffer and in direct string
- Renamed crc32c.js to crc32c because its a node sh file.
- Updated the README to reflect that

Signed-off-by: dozoisch <hugo@dozoisch.com>