Added basic support for IODEF XML to JSON translation

Currently supports the most basic valid IODEF document
Added basic support for IODEF JSON to XML translation

Currently supports the most basic valid IODEF document
formatting
Added the ability to modify the enabled parsers

This allows users to enable only the parsers that are required
in their particular application.
Documented parser enable/disable & IODEF support
Update README.md
Death to ';'
Death to ';'
Death to ';'
Merge pull request #6 from surevine/iodef-support

Added IODEF support