disable test using internet.
Add examples to sdist.

When packaging it's useful to provide the examples to users who may want
to have them locally.  This adds the examples to the sdist so the source
installer can choose if they want to put the examples on their system.
Merge pull request #122 from alunduil/add-examples-to-sdist

Add examples to sdist.
disable internet test
start v0.21.0
include ChangeLog
Merge pull request #123 from dimaqq/master

Basic low-level asynchronous abort functionality
Try to get proxy info from environment if not explicitly provided
Merge branch 'master' of https://github.com/liris/websocket-client

Conflicts:
	websocket/tests/test_websocket.py
Merge branch 'master' of https://github.com/liris/websocket-client
fixed #120
  - merge #123 and add Changelog
Merge branch 'proxy_from_env' of https://github.com/Vodalys/websocket-client into Vodalys-proxy_from_env
Merge branch 'Vodalys-proxy_from_env'
fixed #124
  merge and add some test cases
fixed #125
  but I didn't test it, yet, because I don't have envrioment to test.
clear os.envrion.
fixed two typos (webscoket)

2 typos of webscoket -> websocket
Merge pull request #127 from ishankhare07/master

fixed two typos (webscoket)
fix #126
fixed #129
I didn't reproduce this issue, but this code would be work.