`DataFrameVisitors` handles data frames as columns of data frames, recursively. (#602)
joining factors whose levels are not identical (same levels, same order) generates
  a warning and coerces to character (closes #684). Same when joining a character vector
  with a factor and vice versa.
`rbind_list` fails to combine `INTSXP` and `factor` (closes #751)
`min(.,na.rm = TRUE)` did not handle `Date` encoded as `REALSXP`.  closes #755
data frames and matrices as column of data frame processed by verbs
  generates an error. (0.3.1 part of #602).
some more #602 related tidying things up
less invasive handling of column names with the Name class
update NamedListAccumulator to use Name to be less invasive about column names (no automatic utf8 conversion). #722
added small strings_addresses utility used for testing that we did not invade strings (internal use only)
use Name in LazyGroupedSubsets too
give names to the addresses vector
testing no utf8 invasion #722
Update src-sql.r
Merge pull request #763 from chappers/master

Typos
merging