updated readme and xep list
Add support for XEP-0191 (Blocking command)

Fixes #791

Squash of commits:
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Merge pull request #796 from SamWhited/xep0191

XEP-0191 Support
Add ability to change password on server

Fixes #260

Rebase/Squash of:
a7772017c33ec012444d9979237a2fc3a92f7043
bbd7e2542e08a86477ee6141a0954312adc0de50