Extract PathHelper::getConversionFilename()
Implement import.php to import converted content into MODX

Based on Jason's ImportSpaceContent.php
Fix some issues in import.php and config
Extract SpaceImporter class
Move modX includes and config to import.php & require autoloader
Add comment to fix $sourcePageId inspection warnings
Change the way spaces are configured

Also reorganized some conditionals
Modify SpaceImporter to return an array containing import data

Also, attempt to locate parent when importing new docs
Rename SpaceImporter to DocImporter
Implement DocOrganizer to organize hierarchy of newly imported docs
Implement ContentFixer to fix relative links

Added a new configuration option: fix_links_for_base_href
Implement ResourceGroupSetter to assign resource groups
Minor cleanup
Merge branch 'feature/import' into develop
Add fixLinksForBaseHref MODX plugin
Merge branch 'feature/fix-links-plugin' into develop
Fix tidy handling of HTML5 figure and figcaption tags
Add ERROR constant to HtmlTestCase
Modify code header transformations to output figure with figcaption
Merge branch 'feature/code-figure' into develop