support for using CPLXSXP data in mutate. #436
adding support for complex vector visitors. incidently making filter work with complex vectors. #436
handling of CPLXSXP in arrange. #436
added support for << operator for Rcomplex values. This should really be in Rcpp, hence:
https://github.com/RcppCore/Rcpp/issues/187

[ci skip]
added minimal support for joining complex vectors
need to break from outer switch too [co skip]
make last(., order_by=) and first(.,order_by=) more flexible. closes #626
same fix as previous commit, but for nth. #626
only bring @wch tests from #487. It seems the issue was otherwise fixed. closes #487
enable simple version (one arg only) of lag. #133
additional tests for lead and lag #133
NEWS entry about lead and lag
this seems to do the trick about #656
better renaming of variables when there is a conflict . closes #655
Added right join generic, data.frame and tbl_df impl, and tests checking that the columns are in the ight order. #96
mention right_join in NEWS
data.frame and tbl_df methods for outer_join. tests. #96
remove all except vignettes
merge master into dev_0_3_1
Create README.md