Revert "Move the doc tree out into its own repo."

This reverts commit 8f88fcedd6.

doc-src/dev/testing.html

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+
+All the mitmproxy projects strive to maintain 100% code coverage. In general,
+patches and pull requests will be declined unless they're accompanied by a
+suitable extension to the test suite. 
+
+Our tests are written for the [nose](https://nose.readthedocs.org/en/latest/).
+At the point where you send your pull request, a command like this:
+
+<pre class="terminal">
+> nosetests --with-cov --cov-report term-missing ./test
+</pre>
+
+Should give output something like this:
+
+<pre class="terminal">
+> ---------- coverage: platform darwin, python 2.7.2-final-0 --
+> Name                   Stmts   Miss  Cover   Missing
+> ----------------------------------------------------
+> libmproxy/__init__         0      0   100%
+> libmproxy/app              4      0   100%
+> libmproxy/cmdline        100      0   100%
+> libmproxy/controller      69      0   100%
+> libmproxy/dump           150      0   100%
+> libmproxy/encoding        39      0   100%
+> libmproxy/filt           201      0   100%
+> libmproxy/flow           891      0   100%
+> libmproxy/proxy          427      0   100%
+> libmproxy/script          27      0   100%
+> libmproxy/utils          133      0   100%
+> libmproxy/version          4      0   100%
+> ----------------------------------------------------
+> TOTAL                   2045      0   100%
+> ----------------------------------------------------
+> Ran 251 tests in 11.864s
+</pre>
+
+
+There are exceptions to the coverage requirement - for instance, much of the
+console interface code can't sensibly be unit tested. These portions are
+excluded from coverage analysis either in the **.coveragerc** file, or using
+**#pragma no-cover** directives. To keep our coverage analysis relevant, we use
+these measures as sparingly as possible.
+