Moved all describes tests into their own functions.

Factored out the db specific tests and kept the macros as placeholders.
Import everything in the cabal file for now.
Only using the flags to test that everything still works.

esqueleto.cabal

@@ -107,18 +107,16 @@ test-suite test
       -- This library
     , esqueleto
 
-  if flag(postgresql)
-    build-depends:
-        postgresql-simple     >= 0.2
-      , postgresql-libpq      >= 0.6
-      , persistent-postgresql >= 2.0
+    , postgresql-simple     >= 0.2
+    , postgresql-libpq      >= 0.6
+    , persistent-postgresql >= 2.0
 
+    , mysql-simple          >= 0.2.2.3
+    , mysql                 >= 0.1.1.3
+    , persistent-mysql      >= 2.0
+
+  if flag(postgresql)
     cpp-options: -DWITH_POSTGRESQL
 
   if flag(mysql)
-    build-depends:
-        mysql-simple          >= 0.2.2.3
-      , mysql                 >= 0.1.1.3
-      , persistent-mysql      >= 2.0
-
     cpp-options: -DWITH_MYSQL