websocket Upgrader can be reused

You don't have to create a new websocket Upgrader for each connection

v1.2.6

Merge pull request #124 from lesismal/body_allocator

websocket: add body allocator config

v1.2.5-beta.1

memory optimization for large number of concurrent tls connection

v1.2.5

1. WebSocket client: write with mask
2. add WebSocket proxy server example

v1.2.4

1. add HTTP Client
2. add Websocket Dialer/Client
3. add HTTP config fields

v1.2.3

1. fix epoll mod op
2. clear wtimer

v1.2.2

support nbhttp server update tls certificates

v1.2.1

fix listener exit.

v1.2.0

1. fix dirty buffer
2. optimize buffer pool
3. optimize websocket Upgrader
4. optimize http/websocket executor
5. fix autobahn testsuite
6. details && clear

fix memory corruption issue

The mempool allocator resulted in some memory corruption and autobahn test failures. This release restores the native allocator and adds a copy on the handleMessage method to avoid the buffer from being corrupted in the executor thread