deleted redundant Nest patch and incorporated merge patch into pipeline builder. not sure what i think about that.
code cleanup (try to use reviseHistory instead of manual machinery)
Merge branch 'master' of github.com:slamdata/slamengine
switch over to NodeRenderer-based tree showing
NodeRenderer for the AST
NodeRenderer for AnnotatedTree showing the annotation as (multiple) separate nodes
comment on need for well-typed instance for tuples
implement and use a generic NodeRenderer instance for left-tuples of three
NodeRenderer for Attr
redundant NodeRenderer for Node
expand annotation sub-trees
major cleanup

removed redundant Show instances
renamed to RenderTree, etc.
fixed tuple instance using implicit priority trick
RenderTree.apply
switch to explicit implicit parameters everywhere
use implicit def/val consistently
Merge pull request #79 from mossprescott/prettify

Everything has a NodeRenderer now
Merge branch 'master' of github.com:slamdata/slamengine into between
massive refactoring of pipeline phase, pipeline builder, etc. compiles clean but many tests fail
Add a TravisCI build file.
Merge pull request #80 from sellout/TravisCI

Add a TravisCI build file.
fix a few bugs
code cleanup
fix a few bugs (repatch already patched things)