TS-2303

updating documentation for negative response caching
Add keep-alive documentation (including keep_alive_post_out)
Update CHANGES for TS-2303
TS-2341: Cast TSHttpStatus to int to suppress compiler warning in clang

Because TSHttpStatus is an enum and has a max value less than 599, comparing
<= of a variable of that type with a constant of that magnitude will always
return true. Casting to int removes that guarantee and thus the warning.
Fix list templating
Merge branch 'master' of https://github.com/jacksontj/trafficserver
TS-2339 Cleanup Makefile.am, fix wrong _SOURCES definitions
Added TS-2339.
Merge branch 'master' of https://github.com/SaveTheRbtz/trafficserver
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/trafficserver
TS-2333 Change the SAX callbacks to not clash with libxml2
TS-2333 Use the right SAX.h include
TS-2338 Remove IPRange.cc and .h, and SocksParser.cc
Added TS-2338.
TS-2338 Remove IPRange.h from _SOURCES.
Updating changes for TS-2316
TS-2343 Remove the --schema option from Traffic Manager
Added TS-2343.
TS-2343 Remove --schema from docs, well the little that was there
TS-2340: fix TextLogObject log rolling