move spec and src files to a shardy way

spec/db_spec.cr

@@ -1,6 +1,4 @@
-require "spec"
+require "./spec_helper"
-require "db"
-require "./dummy_driver"
 
 private def connections
   DummyDriver::DummyConnection.connections

spec/dummy_driver.cr

@@ -1,4 +1,5 @@
 require "spec"
+require "../src/db"
 
 class DummyDriver < DB::Driver
   def build_connection(db : DB::Database) : DB::Connection

spec/dummy_driver_spec.cr

@@ -1,6 +1,4 @@
-require "spec"
+require "./spec_helper"
-require "db"
-require "./dummy_driver"
 
 describe DummyDriver do
   it "with_dummy executes the block with a database" do

spec/result_set_spec.cr

@@ -1,6 +1,4 @@
-require "spec"
+require "./spec_helper"
-require "db"
-require "./dummy_driver"
 
 describe DB::ResultSet do
   it "should enumerate records using each" do

spec/spec_helper.cr

@@ -0,0 +1,3 @@
+require "spec"
+require "./dummy_driver"
+require "../src/db"

spec/statement_spec.cr

@@ -1,6 +1,4 @@
-require "spec"
+require "./spec_helper"
-require "db"
-require "./dummy_driver"
 
 describe DB::Statement do
   it "should prepare statements" do

src/db.cr

@@ -118,10 +118,10 @@ module DB
   end
 end
 
-require "./query_methods"
+require "./db/query_methods"
-require "./disposable"
+require "./db/disposable"
-require "./database"
+require "./db/database"
-require "./driver"
+require "./db/driver"
-require "./connection"
+require "./db/connection"
-require "./statement"
+require "./db/statement"
-require "./result_set"
+require "./db/result_set"