`import` all jobs

[Rob Donnelly]

Add ability to import all jobs from a job description file.

import 'prefix', :all, 'file.jr'

[Rob Donnelly]

Maybe support shell style globbing instead.

import 'prefix', '*', 'file.jr'

import 'prefix', ['job_[abc]', 'id?'], 'file.jr'

[Rob Donnelly]

http://ruby-doc.org/core-2.3.0/File.html#method-c-fnmatch