fixing signedness issue in modEpilogue and updated build instructions…

… in README.md

fixed signedness issues with modEpilogue and updated build instructio…

…ns in README.md

Version 2.0 Changes

- Added PT_NOTE to PT_LOAD infection algo.
- Added Relative Relocation poisoning / ctors hijacking for entry-point obfuscation and shared object infection.
- Check to make sure target binary meets payload size requirements.

cleaned up example payloads to reflect opcodes in infector