Merge pull request #387 from Z-Wave-Me/master

Disallow WebDAV MKCOL/PUT/DELETE requests to protected files
Change printf mask %zu -> %lu
 for MS VC++ compatibility http://stackoverflow.com/questions/15610053/correct-printf-format-specifier-for-size-t-zu-or-iu
Merge pull request #391 from pavel-pimenov/pvs-studio-fix-zu

Change printf mask %zu -> %lu
updated certs
Merge branch 'master' of ssh://github.com/valenok/mongoose
updated net skeleton
fix leak in handle_propfind()
release notes dates
stat - function result cache
Set the correct json content-type

Chance text/json to application/json to comply with the RFC.

See http://www.ietf.org/rfc/rfc4627.txt for more information.
Fix style for pointer
80 characters limit + remove tabs
Remove file_stat_t st_cgi;
Merge pull request #406 from Cykey/master

Set the correct json content-type
Merge pull request #403 from pavel-pimenov/fix-cache-call-stat

stat - function result cache
release notes for 5.4
Merge branch 'master' of ssh://github.com/valenok/mongoose
better explanation for websocket2.c example
Removed lua examples
Populate HTTP warning codes
Includes changing 201 "Server Error" to "Internal Server Error"
List mostly borrowed from here http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
418 and 451 also added
Local testing showed a problem with 202 reported as "Server Error" instead of "Accepted"