remove unused MathJax extension, sort extensions one per line
TS-2804: Add regex_revalidate plugin to explerimental plugins directory.
TS-2804: Use TSConfigDir.
Bump lighttpd version
TS-2820: Crash in transformations
TS-2820: Crash in transformations
TS-2820: Adding another check for crash
TS-2839 tsxs does not work on OSX (Darwin).
TS-2839 Fix missing space
Updated builds, added Coverity script
TS-2850: Fix logging of response header length
Make HTTPVersion methods const where appropriate
TS-2618] IOBufferBlock::realloc()'s bounds check is wrong.

Original suggestions from William Bardwell.
TS-2839 Additional fix for tsxs. I'm not sure if this
will break on "gnu" ld, but it works with XCode ld.

Suggestions from James Peach.
TS-2842: Can't set SPDY inactivity timeout with traffic_line
Reviewed: Bryan Call
Update RAT exclude
Add a comment on not using the Insert() APIs, but Set() instead
Remove rat-excludes.txt, it is no longer used
TS-2837: Dangling pointer in URLImpl which may cause core dump
Reviewed: Bryan Call
TS-2391: Traffic Server tries to reverse resolve 127.0.0.1