Add Guardfile. Update README
Add IODecorator class

This class decorates ruby IO instances with some read/write/status methods.
They are not fully functional and suffer from random spec failures, due
to race conditions.
Rebild CliProcess. Fix Specs.

Use only PTY (pseudo terminal) for stdstreams
Assert process has spawned before operations
Delegat reading/writing methods to IO or IODecorator instanes
Bring specs to working order
Implement bin/dummy to help testing processes
Get specs working
Merge branch 'feature/IO-decorator' into develop
Merge branch 'feature/rebuild-CliProcess' into develop