Improve Helpers

closes #1640
closes #1672
- changed to include config using require
- deleted has_tag helper
- deleted json helper
- removed fileStorage and ghostScriptTags helpers from frontend
- added fileStorage and url helper to admin
Add Force SSL Configuration/Middleware

Solves #1300
- Adds forceAdminSSL bool config value
- Adds checkSSL middleware
- Adds redirectSSL helper function
Merge pull request #1542 from pmgarman/ssl
Bug fixes, undefined should not be a string
Merge pull request #1675 from sebgie/issue#1640

Improve Helpers
Serving static assets via asset-rack

closes #1405
- adds asset-rack to package for serving assets
- moves all assets previously served via express.static into an asset rack
- handles url generation for statically served assets
- updates the asset-helper for hbs-templates to get the right url
- allows configuration of local-asstets-deployment directory and CDN