Added Wrap Function to String.js

Wrap Function helps to wrap the html element as First Parameter and the element attributes in JSON string as Second Parameter.
Updated Wrap Function to String.js
Added Wrap Function Test Case to String.test.js

Wrap Function Test Case
Added Wrap Function to String.js
Updated Wrap Function in README
Updated Wrap Function in README
Rename the Method Name from wrap to wrapHTML
Updated the ReadME as per New Method `wrapHTML`
Updated the Test Case for wrapHTML

Updated the Test Case with New Method Name: wrapHTML
Updated the String JS Minified File
Upgraded 1.8.1 Version
Upgraded to 1.8.2 Version

Added New Method: .wrapHTML()
Change default tag from p to span
Change === undefined to == null
Minified with Updated StringJS
Change default tag from p to span in Test Case
Updated the Version to 1.8.1
Updated ReadME
Merge pull request #90 from ramsunvtech/master

Add .wraphtml()
1.9.0