Merge pull request #6 from LiquidThinking/master

pull changes from origin
Merge pull request #7 from LiquidThinking/master

pull changes from origin
updated switchToWindow tests according to updated BrowserTest class
added find by AttributeIs and some minor refactoring changes in tests
added missing test file
Merge pull request #22 from adeel41/AttributeIsElementsFinder

fixed #14 by adding AttributeIs method in XenonElementsFinder and some minor refactorings in Tests Project