[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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   Testing Done:

[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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    Reviewed By:
   Testing Done:

[release] some more work on the release build

[tests] some more test fixes

remove -Werror=sign-compare for now since it's not supported on some …

…older compilers