always validate json files

always validate json files

fix test

first release (miniclip#2)

* Add info about releases

* add new configuration flag for valid input file extensions

* add go dep for dependency management

* add barebones Config test + update dependencies with gomega

* create interface for configs to make it testable

* update dependencies

* add first tests to Configurations

* add getter for new config param

* new logic on valid file extensions

* update documentation

* add some files for testing

* make Consul ACL flag optional

* only set Consul ACL header when flag is provided

* trim any dots on file extensions

* minor documentation fixes