Update owl.carousel.css

prev and next buttons fixed as flexslider style
Merge pull request #2175 from CoverUp/patch-1

Update owl.carousel.css
check if $session->data['guest']['customer_group_id'] &  $session->data['customer']['customer_group_id'] isset

I have come across this issue that when using different modules, some may set the guest item in the session array, but not set the customer_group_id

what happens is this line of code troughs an error. best tot avoid this by checking if set for both the guest array and the customer_group_id item.
modification fix
Design/Layout title fix in select dropdown 

since developers often add more then just a name to the module heading but also html tags to style their name, this started to break the look in design/layout form 

best to strip the html tags so that the title looks normal
Update sagepay_direct.tpl
Update sagepay_direct.tpl
Update nochex.tpl
Merge pull request #2191 from MarketInSG/patch-3

Update nochex.tpl
Merge pull request #2190 from MarketInSG/patch-2

Update sagepay_direct.tpl
Merge pull request #2188 from Dreamvention/patch-3

Design/Layout title fix in select dropdown
Merge pull request #2180 from Dreamvention/patch-2

check if $session->data['guest']['customer_group_id'] &  $session->data[...
https://github.com/opencart/opencart/issues/2181
Merge remote-tracking branch 'upstream/master'