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/programs/.gitignore

@@ -0,0 +1,62 @@
+*/Makefile
+*.sln
+*.vcxproj
+
+aes/aescrypt2
+aes/crypt_and_hash
+hash/generic_sum
+hash/hello
+hash/md5sum
+hash/sha1sum
+hash/sha2sum
+pkey/dh_client
+pkey/dh_genprime
+pkey/dh_server
+pkey/ecdsa
+pkey/ecdh_curve25519
+pkey/gen_key
+pkey/key_app
+pkey/key_app_writer
+pkey/mpi_demo
+pkey/pk_decrypt
+pkey/pk_encrypt
+pkey/pk_sign
+pkey/pk_verify
+pkey/rsa_decrypt
+pkey/rsa_encrypt
+pkey/rsa_genkey
+pkey/rsa_sign
+pkey/rsa_sign_pss
+pkey/rsa_verify
+pkey/rsa_verify_pss
+random/gen_entropy
+random/gen_random_ctr_drbg
+random/gen_random_havege
+ssl/dtls_client
+ssl/dtls_server
+ssl/ssl_client1
+ssl/ssl_client2
+ssl/ssl_fork_server
+ssl/ssl_mail_client
+ssl/ssl_pthread_server
+ssl/ssl_server
+ssl/ssl_server2
+ssl/mini_client
+test/benchmark
+test/ecp-bench
+test/selftest
+test/cpp_dummy_build
+test/ssl_cert_test
+test/udp_proxy
+test/zeroize
+test/query_compile_time_config
+util/pem2der
+util/strerror
+x509/cert_app
+x509/cert_req
+x509/crl_app
+x509/cert_write
+x509/req_app
+
+# generated files
+pkey/keyfile.key