Updated copyright notice.

`find . -type f -not -wholename '*.git*' -exec sed -i '' \
's/Copyright 2013/Copyright 2013-2014/' {} \;`
Applied PSR2 formatting.
Another formatting tweak in XML.
And one more formatting tweak in XML.
Added configuration option for enabling customer group selection.
Added Customer Group multiselect.
Changed customer group logic a bit.
Version bump