Relative links aren't correctly handled.

Problem/Motivation

Relative links aren't handled correctly.

Steps to reproduce

Create a page with a relative link in a field (one that Link Magician will process).
Run Tidy on the page.
Check the 'Skipped' results for the batch (/admin/link_magician/tracking/results/skipped/{batchid})

Proposed resolution

The code in processAnchorTags and processImageTags both ignore the fact that url's in src/href can be relative and should be updated to account for relative links.

Test

Create 2 pages:

1. "Test Page - Child" with the URL alias set to /test/child
2. "Test Page - Parent" with the URL alias set to /test/parent with a relative link to the child:
   <a href="child">Child page</a>

Run link magician on the parent page: drush link_magician:tidy nodeid --nodeid=NNNN
See the "Updated" results (/admin/link_magician/tracking/results/updated/{batchid}). You should see an update to the link listed.