Update classes with the new Bing Ads SKC for PHP API v10 12/15/2015

[onema]

• Update classes with Bing Ads SDK for PHP API v10 12-15-2015
• Each class has been placed in it's own file using https://github.com/onema/classyfile
• The following files have been placed under the examples directory:
  1. AdExtensions.php
  2. BudgetOpportunities.php
  3. BulkDownloadUpload.php
  4. KeywordsAds.php
  5. NegativeKeywords.php
  6. ShoppingCampaigns.php
  7. Targets.php
  8. GeographicalLocations
• Fixes #22