Fixed pre-requisite check
Fixed pre-requisite check

Fixed prerequisite check that threw the following error when activating:
"Plugin could not be activated because it triggered a fatal error.":
"Windows Azure SDK for PHP is not found. Please download and copy the
Windows Azure SDK for PHP to library directory and dependencies to to
dependencies directory
"

JCBauza/Windows-Azure-Storage-for-WordPress,JCBauza/Windows-Azure-Storage-for-WordPress