Version 0.5.3 - Security Update

Security Update
* Correct security vulnerability allowing both private and password protected posts from being accessed through the print page
* Creates is_protected() method to determine if the print page should be visible to the current user
* Remove print_url links from the content when the current user does not have the necessary capabilities to view the print page
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Merge pull request #4 from stevenkword/master

Version 0.5.3 - Security Update

Temporary and merged to keep Git in sync with the WordPress.org plugins repository. Proper fixes to these issues are forthcoming.