Change JS to reorder the scripts on the page

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/google_tag_manager/trunk@77213 735d13b6-9817-0410-8766-e36946ffe9aa
upgrade GTM

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/google_tag_manager/trunk@77228 735d13b6-9817-0410-8766-e36946ffe9aa
Increase Version

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/google_tag_manager/trunk@77229 735d13b6-9817-0410-8766-e36946ffe9aa
[BUGFIX] Added check for window.dataLayer is defined before assigning variables.

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/google_tag_manager/trunk@77447 735d13b6-9817-0410-8766-e36946ffe9aa