generate no pipeline for AND and OR when args do not have pipelines (Fixes #183)
Merge pull request #204 from mossprescott/minor

capture errors during pipeline execution
extract sort keys directly from logical plan so pipeline builder doesn't have to see through groups and other operations; fixes #201
Merge pull request #205 from jdegoes/ready/201

extract sort keys directly from logical plan so pipeline builder doesn't...
Merge pull request #184 from mossprescott/and-with-like

simple fix for #183
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Merge pull request #208 from waffle-iron/master

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Implement MOVE from one path to another in the same backend (fixes #203)
Merge pull request #215 from mossprescott/203-api-MOVE

Implement MOVE from one path to another in the same backend (fixes #203)
remove unneeded dependency on scalaz-task