Missing mysql-chef_gem cookbook

[linc01n]

Since we didn't lock database cookbook, database cookbook version now is 4.0.1.

From 2.3.1 to 3.0.0 (chef-boneyard/database@v2.3.1...v3.0.0#diff-9fd042d4cd1e8f82894bbd7dffb313ecL19), it changed the dependency of the cookbook.

Somehow running vagrant provision centos6 in development it will throw error on could not find recipe mysql for cookbook database

The fix is to lock the database version like this

depends 'database', '~> 2.3.1'

I will send a pull request soon.

related to #59

[patcon]

I think mysql2_chef_gem cookbook was just split out of the database cookbook, but that should be a pretty quick fix. Would be great to get to working with newer database cookbooks, as right now the very strict cookbook requirement is making berkshelf dependency resolution unhappy