"column" strategy that connects adventages "simple" and "table" strategies
support sqlparams parameter for column strategy (only in WHERE clause)
fix tests
column_deleted_at option can be null
fix null value support for column_deleted_at, this colum is also null for default
merge with version 2.2.0
tests and some bug fixes for column strategy: derby, h2, hsqldb, postgresql and mysql databases
fix sql
Merge branch 'master' of https://github.com/jprante/elasticsearch-river-jdbc
comments update
Merge branch 'master' of https://github.com/jprante/elasticsearch-river-jdbc
fix MockRiverSource
Merge pull request #137 from psliwa/master

New strategy: "column"