Lifts matplotlib to v1.5.3 as v1.4.2 is broken. Fixes animation loop being garbage-collected.
Quick fix of two problems:
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The matplotlib v1.4.2 dependency refused to install via pip. Now uses the 'next' version 1.5.3. Still ancient. Needs proper upgrade to matplotlib v3.x.
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Fixes the animation loop being garbage-collected as no reference was held.