Make build_win more explicit about email
Use CFLAGS instead of PKG_CFLAGS
Bump version numbers for devtools and (suggested) roxygen2

To make sure the fixed update_collate in roxygen2(4.0.2.9001) is used
Better compact implementation
Better default package for revdep_*
Update docs
Better revdep check parsing.

Closes #598. Related to #639.
Merge branch 'master' of github.com:hadley/devtools
Fix library setting code
Better strategy for finding and installing deps
Tell the user what's happening
Install packages alphabetically
Need to install development package
Add platform info to revdep output
Include package info in summary
Correct version number
Store versions of dependencies in summary.md
Include package being tested
Remove row names from platform info
Need to remove dev version of package after checks complete