Refactor fetcher using promises
Add support for OPML import

Use the opmlparser module by Dan MacTough.
Testing can be improved to check that the feeds are correctly
imported, but it looks like it works fine so far.
Clean up merge
Confirmed Google Reader OPML import behavior
Fix OPML export headers
Properly test OPML import and export
Fixed kue job process issue.

Added jobs.promote() to check and promote delayed jobs.
Merge pull request #13 from lzanita09/master

Fixed kue job process issue.
Clean up fetcher
Add link to design documentation
Fix spelling
Remove need for parseTags call from OPML import (faster)
Implement and test for support of feeds outside of folders in OPML import
InvalidOPML error
Beginnings of acceptance tests that can be run against Google Reader and other backends
TODO about \n in Google Reader
Test user-info XML in acceptance test
Add subscription tests to acceptance suite
Tests for subscription listing
Test default output type (XML I guess…)