generate no pipeline for AND and OR when args do not have pipelines (Fixes #183)
utilize peekahead to get around limitations of one-step cogroup; fixes #189
Merge pull request #190 from jdegoes/ready/189

utilize peekahead to get around limitations of one-step cogroup; fixes #...
during a squash, if the buffer has any unwind operations, then require structure and delete _id to avoid choking mongodb's need to index _id
Merge pull request #191 from jdegoes/ready/188

during a squash, if the buffer has any unwind operations, then require s...
call optimize on both sides before doing actual merge to simplify resulting pipelines; fixes #192
Merge pull request #193 from jdegoes/ready/192

call optimize on both sides before doing actual merge to simplify result...
handle PUT/POST/DELETE to /data/fs/[path] (Fixes #140)
Merge pull request #195 from mossprescott/140-mongo-writes-2

handle PUT/POST/DELETE to /data/fs/[path] (Fixes #140)
simplify implementation of &&& in a way that guarantees correct result; fixes #199
Merge pull request #202 from jdegoes/ready/199

simplify implementation of &&& in a way that guarantees correct result; ...
capture errors during pipeline execution

The MongoDB Java driver does not usefully report (or even expose)
errors that occur during aggregation operations if they are submitted
through DBCollection. Using DB.command() instead allows us to
explicitly look for failures and to capture the descriptive error
message as seen in mongo shell.
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
add waffle.io badge
Merge pull request #208 from waffle-iron/master

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Merge remote-tracking branch 'upstream/master' into 13-mongodb-equi-joins-merging

Conflicts:
	src/test/scala/slamdata/engine/physical/mongodb/planner.scala
Port John’s sorting fix.