fixed typo in media overlay audio error message // issue #350
B&N's contribution
line endings
fixup tests after merging the main branch into this
update readme.md, README-dist.txt
fix one more failing test that shouldn't have gotten in that way.
ACC_007 & ACC_008 should only be raised on Epub3, not on Epub2.
Fixed a null reference exception when a spine item refers to a non-existent manifest item.  The execption is caught, but zero error messages are reported.
fix merge conflict and make sure the tests pass.
fixup merge
merging BN changes into nook/contrib
Merge BN changes and bug fixes into nook contrib branch
Merge remote-tracking branch 'origin/contrib-nook-partial' into contrib/nook

Conflicts:
	src/main/java/com/adobe/epubcheck/ctc/EpubNCXCheck.java
	src/test/resources/com/adobe/epubcheck/test/DTBook/Basic_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/css/font_encryption_adobe_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/css/font_encryption_unknown_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Epub2_marked_v3_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Epub3_marked_v2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Excessive_Spine_Items_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Fallbacks_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Mismatched_mimetypes_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Missing_NAV_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Missing_NCX_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Missing_Spine_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/Missing_metadata_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/opf/oebps12_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/package/interesting_paths_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/package/missing_mimetype_file_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/package/missing_ncx_file_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/scripts/epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/xhtml/html5_epub2_expected_results.json
	src/test/resources/com/adobe/epubcheck/test/xhtml/singleline_expected_results.json
tweak version number for alpha1 release
[maven-release-plugin] prepare release epubcheck-v4.0.0-alpha1
[maven-release-plugin] prepare for next development iteration
fixup the scm portion of the pom file to reflect the proper repository name on github
[maven-release-plugin] prepare release epubcheck-v4.0.0-alpha2
[maven-release-plugin] prepare for next development iteration
Epubcheck was not building the package manifest item properly due to xml namespace issues.
Certain Epub v2 documents would not emit SCP_004 even thought they had script in them.
remove duplicate plugin to remove warning
[maven-release-plugin] prepare release v4.0.0-alpha3