Move some column creation logic into Column factory functions
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Key: CASSANDRA-2679
URL: https://issues.apache.org/jira/browse/CASSANDRA-2679
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Stu Hood
Priority: Minor
Fix For: 1.0
Expiring and Counter columns have extra creation logic that is better
encapsulated when implemented inside a factory function.
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