bumped version to 0.9.19.

doc: bumped version to 0.9.18.

bumped the API version to 0.9.18.

doc: bumped version to 0.9.17.

bugfix: the user specified ./configure's --with-cc-opt and --with-ld-…

…opt might override the LUAJIT_INC/LUAJIT_LIB and LUA_INC/LUA_LIB environment settings. thanks Julian Gonggrijp for the report in openresty/openresty#117.

bugfix: we might miss the linker option -ldl when we shouldn't.

bugfix: we might miss the linker option -ldl when we shouldn't.

bugfix: access nonexistent fields in the "ngx" table in init_by_lua* …

…could lead to the exception "no request object found" because of the overreacting __index metamethod of the "ngx" table.

more coding style fixes.

doc: bumped version to 0.9.15; also stated that we work with nginx 1.…

…7.10.