new blueprint test spec
add helpers to grunt task deps
add delta test spec
test and fix delta
more tests for delta
remove deprecated diff test, improve delta.js
reformat delta result
extend diff cases
fill blanks with -1
array hasChanged if length changed
update perf test ;)
tidy, build
gate emitter feedback
further improvements for diff
ensure one proviso nomination per item
update delta version
replace tidy with clearProviso
be sure to set changes to undefined when setting idx to -1
more coverage for delta
fix filter and sort