Add the doCookies lib from MDN
Add 'save cookie' & 'clear cookie' in attach ex.

Added 'save cookie' and 'clear cookie' to make attach work across
refreshes
Refactor and rename directories and files

All html files are now moved inside the 'html' dir from the 'bosh'
dir. All files that are snippets to be obtained via ajax are prefixed
with an underscore (eg. _authForm.html). The name of the files to be
opened in browser stay the same (eg. connect.html).

The references in javascript are also changed respectively.
Add requirements.txt in bosh for python deps

Also added the actual venv in .gitignore