db/schema:

Removed `upload` and `input2upload` tables.
db/models:

Removed Upload and Input2upload tables.
db/routers_test:

Removed references to Upload table.
tests/utils/helpers:

Removed references to the `upload` table.
Merge pull request #1025 from larsbutler/drop-upload-table

Drop upload table

[r=matley] [f=*trivial]