Get Sample 1 (Getting Started) to compile with 0.7

This PR is to get Sample 1 (getting started) to compile with Datomisca 0.7, Play 2.3, and Datomic 0.9xxx. The goal was to just get it working without changing any of the behavior. This is still WIP because, while I was able to get it to compile, I wasn't able to get it to run. I don't know if it ran before I touched it, but I'll assume so. I need a code review here. 

This one was a bit tricky for me because I have never used Datomisca 0.6 before, so a lot of the code was foreign to me. So again, a code review would be good :) 

When I run `test` I get the following error:

```
[error]    RuntimeException: : java.lang.IllegalArgumentException: :db.error/datoms-conflict Two datoms in the same transaction conflict: {:d1 #datom[17592186045452 72 17592186045433 13194139534333 true], :d2 #datom[17592186045452 72 17592186045432 13194139534333 true]}  (Selenium.scala:152)
[error] play.api.test.TestServer.start(Selenium.scala:152)
[error] play.api.test.PlayRunners$class.running(Helpers.scala:84)
[error] play.api.test.Helpers$.running(Helpers.scala:403)
[error] play.api.test.PlayRunners$class.running(Helpers.scala:74)
[error] play.api.test.Helpers$.running(Helpers.scala:403)
[error] test.IntegrationSpec$$anonfun$1$$anonfun$apply$1.apply(IntegrationSpec.scala:17)
[error] test.IntegrationSpec$$anonfun$1$$anonfun$apply$1.apply(IntegrationSpec.scala:17)
[error] datomic.error$arg.invoke(error.clj:55)
[error] datomic.error$arg.invoke(error.clj:53)
[error] datomic.db$datoms_conflict.invoke(db.clj:1440)
[error] datomic.db$create_card_one_validator$fn__2671.invoke(db.clj:1518)
[error] datomic.db$validated_tx_datoms$fn__2697.invoke(db.clj:1584)
[error] clojure.core$filterv$fn__6261.invoke(core.clj:6256)
[error] clojure.lang.ArrayChunk.reduce(ArrayChunk.java:63)
[error] clojure.core.protocols$fn__6041.invoke(protocols.clj:98)
[error] clojure.core.protocols$fn__6005$G__6000__6014.invoke(protocols.clj:19)
[error] clojure.core.protocols$seq_reduce.invoke(protocols.clj:31)
[error] clojure.core.protocols$fn__6024.invoke(protocols.clj:60)
[error] clojure.core.protocols$fn__5979$G__5974__5992.invoke(protocols.clj:13)
[error] clojure.core$reduce.invoke(core.clj:6177)
[error] clojure.core$filterv.invoke(core.clj:6257)
[error] datomic.db$validated_tx_datoms.invoke(db.clj:1584)
[error] datomic.db.ProcessExpander.getData(db.clj:2324)
[error] datomic.db$with_tx.invoke(db.clj:2355)
[error] datomic.peer.LocalConnection$fn__8278.invoke(peer.clj:535)
[error] datomic.peer.LocalConnection.transactAsync(peer.clj:535)
[error] datomisca.Connection$.transact$extension(Connection.scala:93)
[error] datomisca.TransactOps$class.transact(TransactOps.scala:53)
[error] datomisca.Datomic$.transact(Datomic.scala:31)
[error] Global$$anonfun$onStart$1$$anonfun$1$$anonfun$apply$1.apply(Global.scala:36)
[error] Global$$anonfun$onStart$1$$anonfun$1$$anonfun$apply$1.apply(Global.scala:35)
[error] Global$$anonfun$onStart$1$$anonfun$1.apply(Global.scala:35)
[error] Global$$anonfun$onStart$1$$anonfun$1.apply(Global.scala:27)
```