Better StagTools class instance

Ensure that there is only one instance of class is loaded or can be
loaded.
Fix issue with twitter widget throwing SSL errors on some hosts

Seems to be throwing issues on Windows Server, and few others as
follows:

SSL certificate problem, verify that the CA cert is OK. Details:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate
verify failed

This fix simply avoids it, h/t (@CFJamesAllen)