Ignore installed requirements despite --download implying --ignore-installed (issue #52)
Ignore installed requirements despite --download implying --ignore-installed (issue #52)

Refer to issue 52 on GitHub for details:
  https://github.com/paylogic/pip-accel/issues/52

paylogic/pip-accel,theyoprst/pip-accel,matysek/pip-accel,pombredanne/pip-accel,theyoprst/pip-accel,matysek/pip-accel,paylogic/pip-accel,pombredanne/pip-accel