Added support for tuples values on query :in or :where

[Quezion]

• Updated q-analyze/resolve-any-idents to ID lookup-refs :in query. Assumed that lookup-refs are either eid in :where clause, or if in value place, that schema has :db/valueType :db.type/ref
• Simple tests on lookup refs & tuple queries in datascript_test.cljc
• Updated dependencies in project.clj

My understanding of the rules for differentiating lookup-refs:

;; ---- :where ----
;; All vectors in :where clause are values because lookup-refs are not allowed in them

;; ---- :in ----
;; Must look at query & understand how variable is being used in :where tuple
;; If variable used as 1st element (entity), always must be lookup-ref
;; If variable used as 3rd element (value), check attribute in schema for :db.valueType :db.type/ref
;; EX: :where [?e :foo ?v]
         :in ?v    = [:x 10]
;; -- check schema for :db/type of :foo, if not db.type/ref then it's a vector value

Fixes #37 , re-posh denistakeda/re-posh#32

This also includes #31, which I rediscovered & fixed in the course of this PR.

[Quezion]

I definitely felt out of my depth working on this library -- but this solution satisfies the added tests on the Clojure side. I'm not sure how to run the tests on the CLJS side via cljsbuild.

There's need for a lot more tests. I could've broken something in the change to eav? -- it's a very simple "fix" & a better implementation might involve checking the :schema like resolve-any-idents does to look for :db.type/ref.

The reason I opened this PR is because I needed this changer to support my own re-frame based app. I'm going to release a sideband version of posh & re-posh off this library so I can continue with my own app development & I'll post back here with the updated dependency coordinates.

[Quezion]

I've published [org.clojars.questyarbrough/posh "0.5.7"] which includes this PR. It's working for my app though it's only exercising small set of DataScript's functionality.

[Quezion]

This functionality is included in pull-many PR #39, so closing this PR. Can split PRs apart & reopen on request.