Log Message:
Update to 1.8.4:

   This is a regular time-based bugfix release.
     * bookmarks: do not forward merged bookmark (issue1877)
     * changelog: convert user and desc from local encoding early
     * fix bookmarks rollback behavior
     * hgrc.5: document shell aliases
     * httprepo: proper handling of invalid responses without content-type \ 
(issue2019)
     * httprepo: send URL redirection notices to stderr (issue2828)
     * localrepo: don't add deleted files to list of modified/added files (issue2761)
     * localrepo: ignore tags to unknown nodes (issue2750)
     * mq: strip extra whitespace from node ids in header (issue2790)
     * rebase: restore mq guards after rebasing (issue2107)
     * revset: expand help for contains predicate
     * revset: note case-insensitive matches in keyword and user
     * revset: note case-sensitive match in grep
     * revset: report a parse error if a revset is not parsed completely (issue2654)
     * revset: the name is optional for the tag predicate
     * simplemerge: do not allow binary files to abort an entire merge
     * strip: make it clear that --force discards changes (issue310)
     * subrepo: don't crash when git .hgsubstate is empty (issue2716)
     * subrepo: make stdin for svn a pipe for non-interactive use (issue2759)
     * subrepo: respect non-default path for incoming/outgoing
     * subrepo: svn abort now depends on exit code (issue2833)
     * subrepo: use code from 71ea5b only if Python needs it (issue2795)
     * tags: catch more corruption during cache parsing (issue2779)