adding ATS and several sample files
Merge remote-tracking branch 'upstream/master'
fixed extension order in languages.yml
adding more varied examples, including an .atxt file
Support of the .ecl file extension for Prolog.
Merge pull request #916 from pchaigno/ecl

Support of the .ecl file extension for Prolog.
Merge pull request #911 from bbarker/master

Added ATS to language list and several samples (try #2).
added .rsx extension to R. 

When we write R extensions for QGIS we have to end the files in .rsx [1]. But the code its pure R. It would be great if github acknowledge those scripts as R scripts.

[1] http://www.qgis.org/es/docs/user_manual/processing/3rdParty.html#r-creating-r-scripts
Added sample of R qgis script
Merge pull request #944 from midraed/patch-1

added .rsx extension to R languge