style: fixed one line's indentation.
bugfix: segmentation fault might happen in nginx 1.4.x when calling ngx.req.set_header on the Cookie request headers because recent versions of nginx no longer always initialize r->headers_in.cookies. thanks Rob W for reporting this issue as #237.
bugfix: no longer automatically turn underscores (_) to dashes (-) in header names for ngx.req.set_header and ngx.req.clear_header. thanks aviramc for the report.
fixed a test that may time out unexpectedly.
added custom test scaffold t::TestNginxLua which subclasses Test::Nginx::Socket. it supports the environment TEST_NGINX_INIT_BY_LUA which can be used to add more custom Lua code to the value of the init_by_lua directive in the nginx configuration.
refactor: save the ngx_log_t pointer instead of the ngx_http_request_t pointer in ngx_http_lua_script_engine_t. this will make the new FFI-based Lua API easier to implement.
Merge remote-tracking branch 'origin/master' into ffi