Add buttons blocking in item_preview.jsp when current user is product
seller.
Change time show, change productPage
Merge remote-tracking branch 'origin/reka' into chemodurov
add error 500 page
Add confirmations on productPage.jsp
Merge remote-tracking branch 'origin/reka' into chemodurov
Merge with reka
Update product-page-button-cheker.js and productPage.jsp
Add uploading images and change avatar.