Expand cell_input_hide cells (%hide) when clicked

https://github.com/sagemath/sagenb/issues/135
Merge pull request #181 from paulbrou/master

Expand cell_input_hide cells (%hide) when clicked
unicode box for the "open your browser" message
Merge pull request #182 from fchapoton/master

unicode box for the "open your browser" message
change URL for bug report

The URL for bug reports now goes to a sagemath.org link
that provides a 301 redirect to whatever is the best
current or future bug reporting platform.
sagenb is not zip safe

This is required for newer versions of setuptools which
will zip up sagenb when installing.
Merge pull request #188 from ohanar/zip_safe

sagenb is not zip safe
Merge pull request #186 from ppurka/issue-redirect-bug-report

change URL for bug report
bump version to 0.10.7.3
Merge pull request #192 from ohanar/version_bump

bump version to 0.10.7.3
catch LookupError from openid creation
add Flask-OldSessions to dependencies
also add Flask-OldSessions to fetch_deps.py

This will allow one to install sagenb completely offline.
finally, modify flask to use the old session cookie interface

this is needed to get openid to work properly.
this should fix #184.
Note: openid also requires account creation to be enabled.
Also limit the range for pytz

Newer versions break sage -t src/sage/all.py on Mac OSX
Add a -s option to dist.sh

This will allow one to repackage sagenb with only the changed
files in sagenb itself.
Otherwise, every time dist.sh is run, it redownloads all the
dependencies all over again. It is waste of time and bandwidth.

With this -s switch, you can avoid redownloading all the
dependencies while packaging sagenb.
Update the version to 0.10.8
Merge pull request #194 from ppurka/issue-184

Fix Issue 184 and update version to 0.10.8
Merge tag '0.10.8' into release