Updated example dependencies
Added link to senecajs.org/data-entities.html
Fleshed out the README for the plugin-web example.
Updated plugin-web example package.json with seneca 0.5.18 and removed use of .httprouter
Migrated Express and fixed breaking errors
Updated all dependencies, removed unused ejs, and fixed breaking changes
Merge pull request #7 from jrpruit1/update/plugin-web

Updated dependencies in data-entities and plugin-web examples