FIX: hanging POST requests when server runs behind reverse proxy

hanging "POST /__es/search" request in under condition. to avoid this problem, just use bodyParser and connect-restreamer.

**Environment**

- Apache 2.4.6
- Phusion Passenger 3.0.23

**Apache Configuration**
```
LoadModule passenger_module /opt/passenger/passenger-4.0.23/buildout/apache2/mod_passenger.so
PassengerRoot /opt/passenger/passenger-4.0.23
PassengerDefaultRuby /usr/local/rvm/wrappers/ruby-2.0.0-p247/ruby
<VirtualHost *:443>
  ServerName kibana.example.com

  DocumentRoot /deploy/kibana-proxy/public/
  SetEnv APP_ID 000000000000.apps.googleusercontent.com
  SetEnv APP_SECRET blah...
  SetEnv AUTHORIZED_EMAILS *@example.com
  SetEnv ES_URL http://localhost:9200
  RequestHeader set X-Forwarded-Proto https
  <Directory "/deploy/kibana-proxy/public">
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
    AuthType None
    Require all granted
  </Directory>
</VirtualHost>
```