Add the first couple Datomic recipes
remove Datomic sub-heading from databases index
Connect to a Datomic Database updates.

Connection protocol list
Differences between Free and Pro w.r.t connections
Connection performance semantics
Connect to a Datomic Database updates.

Minor edits.
Fix heading syntax. Fix uris for datomic:dev protocol
More work on Datomic Schema
Add the first couple Datomic recipes
Connect to a Datomic Database updates.

Connection protocol list
Differences between Free and Pro w.r.t connections
Connection performance semantics
Connect to a Datomic Database updates.

Minor edits.
Fix heading syntax. Fix uris for datomic:dev protocol
More work on Datomic Schema
resolve conflict in databases/databases.asciidoc
Flesh out Datomic Schema recipe
Flesh out Datomic Transaction Basics recipe. Include discussion of transact-asyc, temporary IDs, and realizing in-storage IDs from temporary IDS.
Add Dry-Run Datomic Transactions recipe
Add placeholders for the remaining four recipes
Add author comment to all the recipes. Fix table in Schema recipe.
Cull Datomic excision recipe - too much a direct clone of its documentation.
Datomic retract data recipe.
Merge #169