Make mitm work as a transparent proxy#2

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shosti wants to merge 14 commits intokr:masterfrom

rainforestapp:upstream-merge

Commits on May 1, 2015

Add caching for certificates, makes things much faster.
ukd1
committed

Commits on Jun 9, 2015

Commits on Jun 10, 2015

Commits on Aug 6, 2015

Parameterize proxy director
shosti
committed

Commits on Aug 8, 2015