Support plain .tar cookbooks as well as .tar.gz cookbooks.
This is needed to install afw cookbook http://community.opscode.com/cookbooks/afw
Enable berkshelf-vagrant by default

This commit needs to accompany RiotGames/berkshelf-vagrant#11 which allows the plugin to be enabled/disabled and defaults to disabled.
Check gzip or tar file signatures in Berkshelf::CommunityREST.unpack.
Fix signature check of gzip files.
Use Array#pack to create a gzip file signature.
Fix grammitcal error
Fix 'unpacks the tar' spec.
add addressable gem dependency to gemspec and explicitly require it

in CommunityREST
Merge pull request #461 from RiotGames/addressable

add addressable gem dependency to gemspec and explicitly require it
Merge pull request #457 from danshultz/set_plugin_enabled_default

Enable berkshelf-vagrant by default
Merge pull request #452 from hnakamur/support_plain_tar_cookbook

Support plain .tar cookbooks as well as .tar.gz cookbooks.
add .rspec to gitignore
path locations in Berksfile will be relative to the Berksfile itself
update resolver to accept a Berksfile to ensure sources are loaded
Merge pull request #463 from RiotGames/path-from-berksfile-path

path source should expand from Berksfile location and now CWD
version bump 1.4.0
update changelog
Merge remote branch 'upstream/master' into git-caching