Remove blist as soft dependency

Description

blist as an optional dependency sometimes hides bugs in the internal implementation. We need to stop using blist and commit to the internal one.

For history on internal version: https://datastax-oss.atlassian.net/browse/PYTHON-167?focusedCommentId=18195&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-18195

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Adam Holmberg
October 12, 2015, 4:30 PM
Michael Penick
October 20, 2015, 5:27 PM

+1 changes look good.

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Reporter

Adam Holmberg

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Michael Penick

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