Support local baseline capture

[maestretti]

Allow users to capture a local baseline of their system, store it, and then compare system state to that baseline at a later date. Useful for demo and test purposes. One example would be to baseline a VM, infect it in someway, and then run analysis to confirm detection of the infection.

[maestretti]

Working - https://github.com/maestretti/diffy/tree/issue-46_local_capture

[maestretti]

#48 submitted

[maestretti]

#49 Stolen Glory by @kevgliss fixes.