arbiter needs numpy in installation

[tfoote]

(venv3) ubuntu@ip-172-31-4-117:~$ PYTHONPATH=${INSTALL_SPACE}/lib/python2.7/dist-packages:/opt/ros/kinetic/lib/python2.7/dist-packages:/usr/lib/python3/dist-packages arbiter_start.py -db br-blue -dr br-gold
Traceback (most recent call last):
  File "/opt/sasc/venv3/bin/arbiter_start.py", line 4, in <module>
    __import__('pkg_resources').run_script('arbiter==0.1.1', 'arbiter_start.py')
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 719, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1511, in run_script
    exec(script_code, namespace, namespace)
  File "/opt/sasc/venv3/lib/python3.5/site-packages/arbiter-0.1.1-py3.5.egg/EGG-INFO/scripts/arbiter_start.py", line 9, in <module>
  File "/opt/sasc/venv3/lib/python3.5/site-packages/arbiter-0.1.1-py3.5.egg/arbiter/arbiter_state.py", line 10, in <module>
  File "/opt/sasc/venv3/lib/python3.5/site-packages/arbiter-0.1.1-py3.5.egg/arbiter/swarm_snapshot/__init__.py", line 11, in <module>
  File "/opt/sasc/venv3/lib/python3.5/site-packages/acs_lib-0.1.0-py3.5.egg/acs_lib/acs_uav_state.py", line 28, in <module>
  File "/opt/sasc/lib/python2.7/dist-packages/ap_lib/ap_enumerations.py", line 3, in <module>
    import ap_lib.gps_utils as gps
  File "/opt/sasc/lib/python2.7/dist-packages/ap_lib/gps_utils.py", line 10, in <module>
    import numpy
ImportError: No module named 'numpy'

[tfoote]

fixed in 345139abc03b2c6732ce9800441bf0be42a065b9