2.2.a
	- compatible piwigo 2.2

2.1.c
	- javascript async stuff
	- lv_lv language description

2.1.b
	- themes can define their own rv_menutree_categories.tpl
	- improved javascript (faster, async loading in browser, better compressed zith google closure compiler)

2.1.a
	- compatibility with piwigo 2.1

2.0.c
	- optimizations by calling make_index_url less frequently
	- compatible with IE8