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
Simplify roster handling code

Merge result handling code into IqParser

Conflicts:
	src/main/java/eu/siacs/conversations/parser/IqParser.java
	src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

Refactor IQ parsing and verify roster pushes

Fixes #20

Conflicts:
	src/main/java/eu/siacs/conversations/parser/IqParser.java
	src/main/java/eu/siacs/conversations/services/XmppConnectionService.java