Fix typo in circusweb.rst
Merge pull request #707 from bbinet/master

Fix typo in circusweb.rst
Temporary travis fix not needed anymore
Create commands.rst, remove _HEADER and add comment about circus_ext.py

Take content from circus_ext.py
Refactor in commands-intro.rst
Merge pull request #710 from eikonomega/commands_documentation_update

Commands documentation update
Merge with upstream