add test case capturing entity-unescaping issue described in ARI-3774
add more tests to FastArchivalUrlReplayParseEventHandlerTest (HTML entity escape/unescape)
fix AIR-3794: Wayback unescaping of url causes 404.
now WB re-escape rewritten URL before writing it out.
fixed ParseContextTest broken by commit 0d022943. document behavior change to ParseContext.resolve().
no material code change to ParseContext (just javadoc update and code formatting).
add unescapeAttributeValue property for disabling HTML-unescaping of attribute values. add test case for it.
CLEANUP code formatting.
Merge branch 'refs/heads/ARI-3794' into ait-qa