Update NEWS.md

Fixed typo
Merge pull request #44 from PeteHaitch/patch-1

Update NEWS.md
Use new stringi options for stri_split_boundaries
Merge branch 'master' of github.com:hadley/stringr
Add str_replace_na. #42
Upgrade docs
Updates for latest stringi changes
First round of revdep check.

Forgot to install github version of stringi :(
Rerun with stringi from github
Start preparing cran notes
Use updated stri_wrap
Update replace.r
Update replace.r
Merge pull request #49 from christophergandrud/master

Minor documentation correction ('perform' rather than 'supply'
Only one set of args
Merge branch 'master' of github.com:hadley/stringr
Update locate with new stringi functions
Want to omit matches!
str_match_all should return "" for absent matches.
Update documentation