check: better help for cran option
check: add force_suggests option
check_cran: don't force suggested packages
check: add documentation for new options
Small cleanup of logic
Merge pull request #208 from wch/force-suggests-off

check(): option to turn force-suggested-packages off
Re-roxygenize
check_cran: suppress stdout of each R CMD check process
Ignore compilation products
Single function for finding Rd files.
Fixes #195
Move functions into cran.r
release(): add package version check. Fixes #209
Merge branch 'release-checkver'
Update NEWS
Re-roxygenize
check_cran: print dependencies that are being installed
- Added the initial `install_git` command that allows one to install
  direclty from a git repository.

- Added the documentation page for the `install_git` command as well.

- Adjusted code to reflect peer-review from Hadley
- Added the `git_binary` variable to the documentation.

Changed the name of `get_git_version` to `git_version` to be more similar to `git_path` and other nomenclature.
- Removed superfluous comma at the end of `zzz.r` (Thanks @wch)
- Changes:
  - Clone with --depth 1 and --no-hardlinks. Makes it a whole lot faster.
  - Sys.chmod(755) instead of 777
  - Removed the .git from the name we display when checking out the code
    if a `.git` is present in the base name.
  - Removed the `git_version` function as there's no need for it just
    yet.
Require packages in depends.
Fixes #161, #178, #192
Merge pull request #210 from hadley/depends

Require packages in Depends. Fixes #161, #178, #192.