fix(series_sales): use autogenerated ids to prevent duplicate key violations on insertion later.

See cdb000e commit for details.

Addressed to #1034

Author: php-coder

src/main/resources/liquibase/version/0.4/2016-08-22--series_sales.xml

@@ -72,7 +72,6 @@
 		<comment>Creates series sales and purchases examples</comment>
 
 		<insert tableName="series_sales">
-			<column name="id" value="1"/>
 			<column name="series_id" value="1"/>
 			<column name="date" valueComputed="${NOW}"/>
 			<column name="seller_id" value="1"/>
@@ -85,7 +84,6 @@
 		</insert>
 
 		<insert tableName="series_sales">
-			<column name="id" value="2"/>
 			<column name="series_id" value="1"/>
 			<column name="seller_id" value="3"/>
 			<column name="transaction_url" value="http://example.com/teresa-palmer/sell-stamps"/>