Options to only run a NodeLinter-based linter if linter is a dependency in package.json

This pull request adds two options to a NodeLinter linter that allows users to specify if a linter should only run on a buffer if that buffer represents a file in a project where the linter is a dependency.

For example, let's assume I like using eslint for my own work. If I fork and clone a project that uses JSHint (and the JSHint plugin uses NodeLinter as its base class), then I can set up SublimeText so that the jshint linter plugin is disable by default and only turns on in a project that uses jshint. Furthermore if the eslint linter plugin extends NodeLinter, then I can set up eslint to be disabled if I am in a project that doesn't include eslint as a dependency. 

The two options are `enable_if_dependency` and `disable_if_not_dependency`.