Rename base handler file name.
Add open data.

1. Allow upload police station open data to blobstore.
2. Add new module 'process' to process police stations population.
3. Police stations navigates by pagination doesn't work well. (Reverse broken)
Rename most files.

Just rename, everything should work the same way...
Delete module 'process'.

Move the handler in module 'process' to module 'admin'.
In production GAE, non billing enabled project is allowed to have 2 modules at
most. It's a pity I didn't notice that in any documentation before deploymetn.

GAE server error response when deploy the 3rd module.
Error 400:
--- begin server output ---
Your app may not have more than 2 modules.  Please remove one of the existing
modules by deleting all of its versions before trying to create a new module.
--- end server output ---
Implement police station entities delete handler.
Fix exception when no result in query.
Add info about created entities count.
Remove background thread usage.