Fix object leak using async class

Fix bug; don't run mruby body filter when read upstream buffer completely

Prepare release v2.0.0

Fix cross fiber boundary problem between C and Ruby

Support Async http client

refs: https://github.com/matsumotory/ngx_mruby/pull/345#discussion_r192176381

Fix link in document

Upgrade mruby to 1.4.1 on v2-dev

023070a Set the mruby-1.4.1 release date to `2018-4-27`.
54905e9 `ary_dup()` should not use `ary...

upgrade mruby to 1.4.1

023070a Set the mruby-1.4.1 release date to `2018-4-27`.
54905e9 `ary_dup()` should not use `ary...

Execute the proc object with mrb_run

Rafactor include files

All tests passed, but we still have dirty code.

The result variable of fiber is secured with heep

ngx_mrb_var_set_vector is not executed when fiber is raise

There was an error in log output

fix #357 Create ngx_http_mruby_ctx_t if you do not have it

check valiable format

Support async setcode

I can not proxy when using Async.sleep

Add Nginx.status_code= alias Nginx.return

fix stack smashing detected