Initial checkin of db schema
Added use case for comparing & resolving conflicting diffs
Update use-cases.md

Remove ambiguity in conflict res use case as to who is performing the resolution
Fleshed out use cases for admin UI, adjusted DB schema to properly name boolean columns
Added functions to select diffs from database for given documents. Warning: nasty horrible code
Methods to insert Diffs into DB
Merge branch 'wip-diff-db' into wip-document-crud

Conflicts:
	src/Retcon/Handler.hs