Make new sigs empty by default

Currently they show None if imported using bulk import. Now they're an empty
string,
Only set info to empty if info is None
Merge pull request #67 from joshuablake/empty_bulk_import

Set info as blank on bulk import
Change manual system add form to be more compact.
Merge branch 'system_add' into develop
Better handling of errors getting RSS feeds
Further rss fixes
Replace signature updated indicator with opacity filter.
Mark bulk signatures as updated at 25% instead of 75%
Open k-space systems in map view on Dotlan
Merge pull request #68 from joshuablake/dotlan_map

Open k-space systems in map view on Dotlan
Merge pull request #2 from marbindrakon/develop

refresh own repo