ADEN-1453 Track number of amazon success calls
Added wgIsGASpecialWiki to getWikiVariables
wgIsGASpecialWiki => isGASpecialWiki
Add variableonly if it is true
No wg
Merge pull request #5000 from Wikia/HG-192

HG-192: Added wgIsGASpecialWiki to getWikiVariables
Merge pull request #4993 from Wikia/aden-1453-track-amazon

ADEN-1453 Track number of amazon success calls