not yet enabled impl of %in%. #126
using can_simplify directly
merge CallProxy and HybridCall functionality into a single class to avoid some code redundancy
Update databases.Rmd
more explicit message about impossible subset of a grouped_df. #691
Fix tally documentation

Fix tally documentation. It should be count() instead of tally().
Merge pull request #707 from LluisRamon/patch-1

Fix tally documentation
Merge pull request #706 from nhanitvn/master

Update databases.Rmd: fix wrong column name 'carrer'
Update docs
typo
Merge pull request #711 from davidkane9/master

typo
meaningful message for group_by with unknown column. closes #716
mutate handles constant factors. closes #715
Merge github.com:hadley/dplyr

Conflicts:
	vignettes/introduction.Rmd