Update easyResponsiveTabs.js

Created hash variable. 
Created variable to check for history functionality. 
Added variable for holding id string of element.
Update the history state when tab clicked.
Update easyResponsiveTabs.js

Moved the adding of the active tabs classes outside the aria-controls loop because they only need to be assigned once.
Added the ability to select the tabs other than the first based off of the URL hash.
Update easyResponsiveTabs.js

Updated the hash state tracking to work with multiple instances on the same page
Update README.md

Updated to include linking to tabs and maintaining the state functionality.
Merge pull request #17 from iwsscode/hash-improvements

Hash improvements