installation: psycopg2 -> psycopg2-binary

[dinosk]

Closes #101

Signed-off-by: Dinos Kousidis konstantinos.kousidis@cern.ch

[dinosk]

This will remove the following warning:

...
Collecting psycopg2>=2.7.3 (from invenio-db==1.0.0)
/Users/dinossimpson/.pyenv/versions/2.7/envs/db-qa-2/lib/python2.7/site-packages/pip/_vendor/urllib3/util/ssl_.py:339: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  SNIMissingWarning
/Users/dinossimpson/.pyenv/versions/2.7/envs/db-qa-2/lib/python2.7/site-packages/pip/_vendor/urllib3/util/ssl_.py:137: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecurePlatformWarning
...

...
Collecting psycopg2-binary>=2.7.3 (from invenio-db==1.0.0)
  Using cached psycopg2_binary-2.7.4-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
...