Add blist.sortedset to cql encoders
Merge pull request #129 from EverythingMe/master

Add blist.sortedset to cql encoders
Debug log when responding to auth challenge

Relates to #128
Fix Cluster._is_shutdown check in decorator
Log DC details about discovered hosts
Avoid unneeded rebuild of token replica map
Merge branch '1.x'
Avoid rebuilding token metadata when topology has not changed
Avoid preparing queries against ignored hosts
Merge branch '1.x'
Update changelog
Merge branch '1.x'
Add link to cassandra.concurrent in Performance docs
Move auth_provider validation to attr setter
Add Security docs page
Create Upgrading section of docs
Various doc fixes
Better index page for driver docs
Add missing 'versionadded' directives, minor cleanup
Make next version in CHANGELOG 2.0.0