Only overwrite stored details in database if new info

Bulk import always assumed information given was the most current. This
meant reimporting an old sig would delete everything.
Merge pull request #34 from joshuablake/fixMassImport

Only overwrite stored details in database if new info
Merge branch 'develop' of github.com:marbindrakon/eve-wspace into develop
Merge branch 'develop' into release-0.2