Added feature to automatically generate cookbooks with built-in support for chef-minitest. Tests included.

When cookbook command is given --chef_minitest option, Berkshelf will now generate empty chef-minitest files and include the minitest-handler in the run_list of the Vagrantfile.
Accidentally left a redundant template file in the generator_files directory
Uncommenting broken test in init_generator_spec.rb
Berksfile modified to wrap a group around minitest-handler, so that upload can be done without deploying cookbook to server.
Bugfix, ensure that libraries aren't created with invalid characters in name.
Added feature to automatically generate cookbooks with built-in support for chef-minitest. Tests included.

When cookbook command is given --chef_minitest option, Berkshelf will now generate empty chef-minitest files and include the minitest-handler in the run_list of the Vagrantfile.
Accidentally left a redundant template file in the generator_files directory
Uncommenting broken test in init_generator_spec.rb
Berksfile modified to wrap a group around minitest-handler, so that upload can be done without deploying cookbook to server.
Bugfix, ensure that libraries aren't created with invalid characters in name.
Merge branch 'master' of github.com:charlesjohnson/berkshelf
Merge branch 'chef-minitest' of github.com:charlesjohnson/berkshelf into chef-minitest
Fixed tests for the chef-minitest flag.

The spec test only works on the first pass / when online. The automatically recorded VCR fixture contains binary blobs and throws errors on subsequent passes. Fixture not included in this commit.