Update databases.Rmd
Make ruler width customisable
Update data.r

This variable is never used, so I believe it can be safely removed
export sample_n/frac methods for grouped_df
Update group-by.r
Re-export `%>%` without a copy

Fixes #488
correct typo in ?manip
correct small typo in introduction vignette
fix typos in ?tbl_df
grammar-o
Merge pull request #510 from craigcitro/patch-1

grammar-o
Merge branch 'master' of github.com:hadley/dplyr
Pass ... onto base functions. Closes #507
Merge pull request #500 from ncarchedi/master

Correct a few scattered typos
Merge pull request #496 from jimhester/pipe_export

Re-export `%>%` without a copy
Update docs
Subset tbl_cube with list of length 1.
Closes #480
Ignore missing names in select. Closes #492
Fix think-o in tests
Merge pull request #457 from tcarnus/patch-1

Update databases.Rmd