Fix up tests for change in all.equal behavior

R-devel (will be R 3.2.0) has a change in behavior of all.equal for environments.
This change fixes the tests for this new behavior.
Update README.md

I see that the `lazy` package name has changed to `lazyeval`
Merge pull request #270 from ijlyttle/patch-2

Update README.md
Bump dplyr version dependency
Remove `:=`
Update test specs
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
synching with rstudio:master

Merge branch 'master' of git://github.com/rstudio/ggvis

Conflicts:
	R/compute_bin.R
	R/layer_bins.R
	man/bin_vector.Rd
	man/compute_bin.Rd
	man/layer_histograms.Rd
	tests/testthat/test-compute-bin.r