add loop OrderProductTax
Add customer version
	modified:   core/lib/Thelia/Model/Base/Customer.php
	modified:   core/lib/Thelia/Model/Base/CustomerQuery.php
	new file:   core/lib/Thelia/Model/Base/CustomerVersion.php
	new file:   core/lib/Thelia/Model/Base/CustomerVersionQuery.php
	modified:   core/lib/Thelia/Model/Base/Order.php
	modified:   core/lib/Thelia/Model/Base/OrderVersion.php
	modified:   core/lib/Thelia/Model/Base/OrderVersionQuery.php
	modified:   core/lib/Thelia/Model/Customer.php
	new file:   core/lib/Thelia/Model/CustomerVersion.php
	new file:   core/lib/Thelia/Model/CustomerVersionQuery.php
	modified:   core/lib/Thelia/Model/Map/CustomerTableMap.php
	new file:   core/lib/Thelia/Model/Map/CustomerVersionTableMap.php
	modified:   core/lib/Thelia/Model/Map/OrderVersionTableMap.php
	modified:   local/config/schema.xml
	modified:   setup/thelia.sql
	modified:   setup/update/2.1.0-alpha1.sql
Merge pull request #684 from zzuutt/add-loop-OrderProductTax

add loop OrderProductTax
Merge pull request #687 from lovenunu/customer

Add customer version
update symfony version to 2.3
new method Thelia::isInstalled
remove class-loader component and enable debug
update changelog