prepare for next release (2.3.3)

Hi,
in this pull request i have 5 commits.

1) K2 1.3 released.

2) i added Joomla Auto Update system to xmap that it read updates from your github and download releases from your site. see xmap-update.xml

3) Based on "https://opentranslators.transifex.com/projects/p/xmap/"  
I added below 100% translations :
Czech (Czech Republic) (cs-CZ) - Thanks to David Mara
Dutch (Netherlands) (nl-Nl) - Thanks to Steven Zeegers
Russian (Russia) (ru_RU)

4) Maked all index.html's valid

5) Code cleaned up and beautified. in this i beautified and cleaned up all files. tab characters replaced by 4 spaces and ....

because of that xmap 2.3.2 has many bug with joomla 3. please review this changes and release xmap 2.3.3 version.

thank you.