Update NEWS
new histogram stuff based on center/width/boundary
right = TRUE -> closed = "right"
Revert extraneous changes and style fixes
Simplify compute_bin code
Revamp compute_bin tests
Re-document
Deprecate binwidth argument
Replace remaining 'binwidth' with 'width'
Merge pull request #268 from rstudio/histograms

Histogram improvements
Update test specs
Fixes for R CMD check
Use pretty() to calculate auto bin width
Use pretty to find bounds for dates and times
Update test specs
Switch away from plyr because dplyr bug was fixed