Update COPYRIGHT.txt

updating year in copyright
Update CONTRIBUTORS.txt

adding manu into contributors
Merge pull request #213 from stephaniepinet/master

Update order-invoice.html
fix test suite
coupon code input is now required
Fix french translation
add php 5.6 to travis
Merge pull request #214 from apachot/master

Update contributors list
Merge pull request #215 from enurit/patch-4

Fix french translation
Fix Coupon RemoveXPercent missing round
	modified:   core/lib/Thelia/Coupon/Type/RemoveXPercent.php
Merge pull request #216 from lovenunu/master

Fix Coupon RemoveXPercent missing round
fix "informations" typo. Fix #100
[Front office] Modifying upsell products

Display off upsell products is now based on accessory loop but not promo products
[Front office] Modifying upsell products

Display of upsell products is now based on accessory loop but not promo products
[Front office] Modifying upsell products

Display off upsell products is now based on accessory loop but not promo products
[Front office] Modifying upsell products

Adding limit 3 + random order on loop accessory
[Front office] Modifying upsell products

Fixing $ID in some loops
modify the smarty syntax
Merge pull request #221 from enurit/patch-5

[front office] Modifying upsell products popup
remove repeated order by on lang loop