Create `berks open` command

Builds on #222 to fix the issues surrounding vim
honor chefignore when vendorizing cookbooks
add license to gemspec
Merge pull request #254 from sethvargo/219_berks_open

Create `berks open`
Update ohai version in features
add unit test
lock the ohai version in install_command.feature to prevent future test failures
hacky solution to FileUtils.cp_r test
Merge pull request #260 from sethvargo/lock_ohai

lock the ohai version in install_command.feature to prevent future test failures
Merge pull request #256 from sethvargo/248_chefignore

Honor chefignore when vendorizing cookbooks
remove requires from function bodies
minor style update
temporarily hide 'open' task while it is improved
version bump 1.1.0
Create CONTRIBUTING.md

Dedicated document for better GitHub integration.
See https://github.com/blog/1184-contributing-guidelines.
Merge pull request #262 from dwradcliffe/patch-1

Create CONTRIBUTING.md
remove duplicated contributing section
Typo
Allow wider range of repository URIs (#257)
Merge pull request #265 from GnomesLab/issue-257

Allow wider range of repository URIs (#257)