don't seem to use ...
renamed
update new in release doc
move magic wand example. Explain interaction with vectorization.
explain what vectorized grouping does and relation to extend
Merge branch 'dev'

decided to pull in the latest as there is a little delay in releasing rmr2.
rename to testing to avoid suggesting incompatibility
updated special var .. and dependency
evicted magrittr, refresh, .. rename
moved docs for magic.wand
more details on output
document on fast aggregation
test results
merge from master almost at 0.4.0

Merge branch 'master' into dev

Conflicts:
	pkg/R/common.R
undo merge damage