Remove all standard_caveats calls
Update scipy to 0.13.1
Fix for matplotlib and freetype 2.5.1

Fixes #62.
Do not apply patches if building from HEAD.
matplotlib: cleanup python usage.
numpy: cleanup python usage.
ooni-probe: cleanup python usage.
pillow: cleanup python usage.
pydoop: cleanup python usage.
pygame: cleanup python usage.
pypcap: cleanup python usage.
retext: cleanup python usage.
scapy: cleanup python usage.
scipy: cleanup python usage.