Imported Upstream version 1.4.2
Merge tag 'upstream/1.4.2'

Upstream version 1.4.2
upgraded ngx_lua to 0.9.0.
upgraded ngx_devel_kit to 0.2.19.
upgraded ngx_set_misc to 0.22.
upgraded ngx_echo to 0.48
upgrade drizzle to 0.1.6
upgraded ngx_srcache to 0.22.
upgrade ngx_postgresql to 1.0rc3
upgraded ngx_headers_more to 0.22.
upgrade ngx_memc to 0.13.
new openresty upstream version