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/suites/test_suite_arc4.function

@@ -0,0 +1,36 @@
+/* BEGIN_HEADER */
+#include "mbedtls/arc4.h"
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_ARC4_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void mbedtls_arc4_crypt( data_t * src_str, data_t * key_str,
+                         data_t * hex_dst_string )
+{
+    unsigned char dst_str[1000];
+    mbedtls_arc4_context ctx;
+
+    memset(dst_str, 0x00, 1000);
+    mbedtls_arc4_init( &ctx );
+
+
+    mbedtls_arc4_setup(&ctx, key_str->x, key_str->len);
+    TEST_ASSERT( mbedtls_arc4_crypt(&ctx, src_str->len, src_str->x, dst_str ) == 0 );
+
+    TEST_ASSERT( hexcmp( dst_str, hex_dst_string->x, src_str->len, hex_dst_string->len ) == 0 );
+
+exit:
+    mbedtls_arc4_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
+void arc4_selftest(  )
+{
+    TEST_ASSERT( mbedtls_arc4_self_test( 1 ) == 0 );
+}
+/* END_CASE */