adding db view for neighborhood specific summary

[mrcnc]

Related to #12

Adding this view enables a simple query for the number of open issues in each neighborhood.

nola311=> select * from nola311.open_tickets_neighborhood_summary where neighborhood_district = 'BROADMOOR' order by num_issues desc;
             issue_type              | neighborhood_district | num_issues
-------------------------------------+-----------------------+------------
 Pothole/Roadway Surface Repair      | BROADMOOR             |         47
 Street Flooding/Drainage            | BROADMOOR             |         24
 Catch Basin Maintenance             | BROADMOOR             |         19
 Sidewalk Repair                     | BROADMOOR             |         18
 Traffic Sign                        | BROADMOOR             |         14
 Tree Service                        | BROADMOOR             |         12
 Subsidence                          | BROADMOOR             |         12
 Traffic Signal                      | BROADMOOR             |          7
 Street Light                        | BROADMOOR             |          6
 Abandoned Vehicle Reporting/Removal | BROADMOOR             |          6
 Manhole Cover Maintenance           | BROADMOOR             |          6
 Road Shoulder Repair                | BROADMOOR             |          4
 Road Surface Marking                | BROADMOOR             |          3
 Residential Recycling Programs      | BROADMOOR             |          2
 Illegal Dumping Reporting           | BROADMOOR             |          2
 Trash/Garbage Pickup                | BROADMOOR             |          1
 Large Item Trash/Garbage Pickup     | BROADMOOR             |          1
(17 rows)