Merge branch 'pr/13'

Add unit pricing measure

Merge pull request #5 from studioartcz/nette-v2-4

nette 2.4 require

Merge remote-tracking branch 'origin/master'

Merge pull request #4 from studioartcz/kdyby-console-fix

require: kdyby/console version upgrade

add encoding for google

update heureka feed

compatibility php 5.3

fix google param

add category helpers