vit-2741::added google tag manager support to li3_analytics

vit-2741::refined format

vit-2741::changed file name

vit-2741::removed the noscript check since gtm always turn it on

vit-2741::removed noscript and session
Merge pull request #7 from mdx-dev/feature/vit-2741

vit-2741::added google tag manager support to li3_analytics