Specflow Test execution report with tags

New Features:
+ Specflow Test execution report derived through MSTest or NUnit
displays the tags attached with each scenario or feature in a seperate
column viz. "Category"
+ Minor fix for a toggle functionality in the XSLT file to make it work
consistently with IE and Chrome.
New Features:
+ Specflow Test execution report derived through MSTest or NUnit
displays the tags attached with each scenario or feature in a seperate
column viz. "Category"
+ Minor fix for a toggle functionality in the XSLT file to make it work
consistently with IE and Chrome.
Revert "Specflow Test execution report with tags"

This reverts commit f60e5d442a4e8232d8ff2e4a18b88b5aa567deaa.
Add "category" nodes for tags through MSTest Report

Added "nunit:category" node for representing tags when MSTest
Report(trx) is used for generating the Specflow report.