Core - Moved first run code to the static utility class

Core - Improved first run code, this closes #504
Storage - Fixed some migrations on fresh databases

src/Artemis.Storage/Migrations/M1AttributeBasedPropertiesMigration.cs

@@ -9,6 +9,8 @@ namespace Artemis.Storage.Migrations
 
         public void Apply(LiteRepository repository)
         {
+            // DropCollection will open a transaction so commit the current one
+            repository.Database.Commit();
             if (repository.Database.CollectionExists("ProfileEntity"))
                 repository.Database.DropCollection("ProfileEntity");
         }

src/Artemis.Storage/Migrations/M3PluginEntitiesIndexChangesMigration.cs

@@ -6,9 +6,11 @@ namespace Artemis.Storage.Migrations
     public class M3PluginEntitiesIndexChangesMigration : IStorageMigration
     {
         public int UserVersion => 3;
-
+        
         public void Apply(LiteRepository repository)
         {
+            // DropCollection will open a transaction so commit the current one
+            repository.Database.Commit();
             if (repository.Database.CollectionExists("PluginEntity"))
                 repository.Database.DropCollection("PluginEntity");
             if (repository.Database.CollectionExists("PluginSettingEntity"))