Add mbedtls wrapper, custom crypto lib path, test files (#803)

* add mbedtls crypto wrapper.
add tests files for new aead ciphers
add custom lib path support
fix some typo

* fix forbidden ip list

* rm crypto lib build files

* remove crypto source

* add xchacha20 test config

* convert dos new line format to unix format

* Fix help msg

.travis.yml

@@ -16,6 +16,8 @@ before_install:
   - pip install pep8 pyflakes nose coverage PySocks
   - sudo tests/socksify/install.sh
   - sudo tests/libsodium/install.sh
+  - sudo tests/libmbedtls/install.sh
+  - sudo tests/libopenssl/install.sh
   - sudo tests/setup_tc.sh
 script:
   - tests/jenkins.sh