Release v4.1.4

Bump to v4.1.3

Replace old sample images with nice shiny images

Ensure reproducible packaging of libs

The old script sometimes ignored version numbers in requirements.txt if eg Flask was installed from wheel (installing its own version of itsdangerous) before itsdangerous was installed from wheel (our version). I don't know why Alex made it so complicated, just doing pip installs and tarring the result produces the exact same zip (this time with the requested versions!)

Document standard upgrade procedure

Improved width for Linux rendering

Clarify a bit

Merge pull request #4 from quru/python3

QIS v3.0.0 - move to Python 3

Bump SQLAlchemy

It seems we may be affected by a bug in 1.1.15 affecting stats
recording when there is a deleted image and we perform a rollback

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