Removing custom install in tox.ini and use of custom PyCrypto.

Author: dhermes

appveyor.yml

@@ -88,7 +88,6 @@ install:
   - "%CMD_IN_ENV% pip install wheel"
   - "%CMD_IN_ENV% pip install nose"
   - "%CMD_IN_ENV% pip install unittest2"
-  - "%CMD_IN_ENV% pip install https://dlitz.net/pub/dlitz/crypto/pycrypto/pycrypto-2.7a1.tar.gz"
 
 build_script:
   # Build the compiled extension

tox.ini

@@ -3,8 +3,6 @@ envlist =
     py26,py27,py33,py34,cover,docs,lint
 
 [testenv]
-install_command =
-    {toxinidir}/scripts/custom_pip_install.sh {opts} {packages}
 commands =
     nosetests
 deps =