Feature/mbedtls (#84)

* try to import mbedtls and build it

* add stubs socket class

* some boilterplate, read and write function implemented

* more boilterplate / current error in handshake because no CA cert is setup

* add something so skip ca verification, can ws curl https://google.com !

* cleanup / close implemented

* tweak CMakefiles

* typo in include

* update readme

* disable unittests

third_party/mbedtls/tests/Descriptions.txt

@@ -0,0 +1,22 @@
+test_suites
+    The various 'test_suite_XXX' programs from the 'tests' directory, executed
+    using 'make check' (Unix make) or 'make test' (Cmake), include test cases
+    (reference test vectors, sanity checks, malformed input for parsing
+    functions, etc.) for all modules except the SSL modules.
+
+selftests
+    The 'programs/test/selftest' program runs the 'XXX_self_test()' functions
+    of each individual module. Most of them are included in the respective
+    test suite, but some slower ones are only included here.
+
+compat
+    The 'tests/compat.sh' script checks interoperability with OpenSSL and
+    GnuTLS (and ourselves!) for every common ciphersuite, in every TLS
+    version, both ways (client/server), using client authentication or not.
+    For each ciphersuite/version/side/authmode it performs a full handshake
+    and a small data exchange.
+
+ssl_opt
+    The 'tests/ssl-opt.sh' script checks various options and/or operations not
+    covered by compat.sh: session resumption (using session cache or tickets),
+    renegotiation, SNI, other extensions, etc.