Add ability to use plugins

[tjbenton]

This issue started in #163

Here's the list of plugins that we could write to make the main fakeit lib smaller an easier to maintain.

• fakeit-plugin-models-yaml Support parsing YAML model files like fakeit currently does
• fakeit-plugin-faker This would extract out faker from the base fakeit library
• fakeit-plugin-chance This would extract out chance from the base fakeit library
  Note: the faker and chance plugins will have to support seeds
• fakeit-plugin-format-json This would allow the ability to output files in json. This would be a separate package for consistency but I think should still be installed by default since it doesn't depend on anything.
• fakeit-plugin-format-cson This would allow the ability to output files in cson.
• fakeit-plugin-format-csv This would allow the ability to output files in csv.
• fakeit-plugin-format-yaml This would allow the ability to output files in yaml
• fakeit-plugin-console This will output the data to the console.
• fakeit-plugin-couchbase This will output the data to a Couchbase server.
• fakeit-plugin-sync-gateway This will output the data to a Couchbase Sync Gateway server
• fakeit-plugin-directory The directory path to output the files (aka path/to/the/destination)
• fakeit-plugin-zip This would add support for creating zip files of the documents
• fakeit-plugin-babel This would add support for babel

Moving all these things out into separate packages will reduce the dependency bloat that currently exists. At a minimum we can remove 17 packages from the base libraries dependencies and they can be installed separately when they're needed for each plugin.

• adm-zip
• babel-core
• babel-helpers
• babel-runtime
• chance
• cli-table
• couchbase-promises
• cson
• csv-parse
• csv-stringify
• faker
• highlight-es
• request
• set-cookie-parser
• yamljs
• events-async
• find-root