Accept templates from file system

[bboynton97]

Currently if you include the --template argument in your command, it first checks the internal template folder, then checks if the arg value has https:// and attempts to fetch it.

If not https:// and not in the templates folder, check if a file exists at the path of the arg value, if so, validate it as a template file (#85). if it vallidates, use it as a template