Move docker sync exclusions into framework

[garethmidwood]

Migrated from garethmidwood/cdev#31

Frameworks should have their own docker-sync exclusion lists

There should be a generic list merged with this, this will cover dev files (e.g. node_modules) that aren't required to sync.

This should probably be namespaced under environment. Added directly to the framework class could result in a mega-bloated framework in order to support multiple environments.