better toString for LogicalPlan and Data
improved debug logging

RenderTree instances for WorkflowBuilder, WorkflowOp

fix grouped value node type

fix toString() for DocVar.ROOT()

clean up tree rendering for Group and Reshape

use round box glyph
rename test/data files
implement DISTINCT as query modifier and as unary operator (Fixes #211)
comment mongolocal backend
Merge pull request #289 from mossprescott/jenkins-fixes

Remove dependency on local mongodb instance
Switch to scalac 2.11.2.

This also required updating a couple third-party packages, which
required updating our code to their new API (minor).

And the new compiler has already found two bugs, also fixed here.
Merge remote-tracking branch 'upstream/master' into ready/scalac-2.11

Need updated integration tests.
A few improvements to the `ready` script.

* fetch _all_ remotes (was missing upstream, which meant we didn’t merge
  all changes)
* fix origin branch check
* Switch to safer bash constructs – `$()` instead of backticks and
  `[[]]` instead of `[]`
Merge pull request #291 from sellout/ready/git-workflow-changes

A few improvements to the `ready` script.
Merge pull request #290 from sellout/ready/scalac-2.11

Switch to scalac 2.11.2.
Fixes #177:

1. Added variable to SQL grammar (:foo), along with tests; discovered boolean literal was missing and added it.
2. Support variable through all of semantic phases, but not in the logical plan compiler.
3. Add method to substitute variables based on type inference with fallback to "string inference" (generalized mapUp and other enhancements).
4. Revamped regression test to support variables, and added new regression test to verify variables work.
5. Added variable support to REPL.
6. Extracted out planner logic from backend and moved into planner.
7. Changed front-end query API to expect `Destination` header and use query parameters as query variables
8. Updated README to reflect new API changes.
merge
add test for parsing TRUE / FALSE literal values, as well as support for parsing them
added support to compiler for boolean literals
address some pr feedback
add maintenance scripts; move all scripts to scripts/ dir
Merge pull request #292 from jdegoes/ready/177

Add support for variables in SQL queries (#177)
Merge pull request #294 from mossprescott/ready/scripts-dir

add maintenance scripts; move all scripts to scripts/ dir
“Quick” fix to REPL breakage.