Before merging UI with django auth. (minor changes)

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Merge branch 'alisha' of https://github.com/QRAAT/QRAAT into alisha
Changed add transmitters page, put in manage transmitters
change continuous_covariance so it doesn't handle file write
Added obj deletion checking and transmitters deletion
Merge branch 'jey_qraat_site_0.1' into merge-alisha-jey
Added new sidebar to edit-project"
Changed side bar style
Added transmitter edition pages
position.py: Steering_Vectors -> steering_vectors.
Merge branch 'master' of https://github.com/QRAAT/QRAAT
Added targets managment page and targets deletion
Changed objects add button and create-target.html parent
Added target edition
Added locations management and edit pages
new file_sink block
installation files for file_sink
Fixed manage_project_base for empty list of objects
fixed manage pages crashing when obj_list is empty
Merge branch 'master' into jey_qraat_site_0.1
import file_sink into qraat.rmg namespace in python