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
new approach to tree rendering
use NodeRenderer as a proper type class
NodeRenderer instances for Pipeline and its components
label Results in the output; show '...' only if there are actually more results that aren't shown
Merge pull request #78 from mossprescott/usability-2

Small improvement to the way results are shown in the REPL
Merge pull request #77 from mossprescott/prettify

new approach to tree rendering
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
massive refactoring of pipeline phase, pipeline builder, etc. compiles clean but many tests fail