Fix incremental compilation problem caused by Slick.

This is temporary fix to decrease compilation time in development. Therefore this fix will be reverted in the future to add multiple database support capability.

src/main/scala/model/Profile.scala

@@ -1,9 +1,7 @@
 package model
 
-import slick.driver.JdbcProfile
-
 trait Profile {
-  val profile: JdbcProfile
+  val profile = slick.driver.H2Driver
   import profile.simple._
 
   // java.util.Date Mapped Column Types

src/main/scala/model/package.scala

@@ -1,10 +1,5 @@
-package object model extends {
-  // TODO [Slick 2.0]Should be configurable?
-  val profile = slick.driver.H2Driver
-  // TODO [Slick 2.0]To avoid compilation error about delete invocation. Why can't this error be resolved by import profile.simple._?
-  val simple = profile.simple
-
-} with AccountComponent
+package object model extends Profile
+  with AccountComponent
   with ActivityComponent
   with CollaboratorComponent
   with GroupMemberComponent
@@ -16,9 +11,11 @@ package object model extends {
   with PullRequestComponent
   with RepositoryComponent
   with SshKeyComponent
-  with WebHookComponent with Profile {
+  with WebHookComponent {
+
   /**
    * Returns system date.
    */
   def currentDate = new java.util.Date()
+
 }