[version] set to v0.8.5

bump version to v0.8.5-rc1

[release] version bump to v0.8.4

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[build] fixes...

[index] do a full sort if new lines have a timestamp before the last …

…indexed

add some NEWS

[perf] avoid an initial forced index rebuild

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[release] take out freebsd build and skip distcheck for OS X for now

[log_vtab_manager] fix lookup_impl()

[travis] try to publish builds on github

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