fixes issue #90 by reordering migrations

a later migration duplicates the table to rename a column, but uses hard-coded sql to recreate
the table, losing any changes made between the original SB branch and the anime branch.

reordering the migrations allows the changes to proceed as normal.
fixes migration numbering

migration version numbers were incorrect (1080p/raw looked for v12 instead of v14). more than
likely this didn't break anything since it looks for >= x, but worth clearing up anyway.
fixes github issue:4

test_obj was only ever being set once and compared once, so testing for the existence of the
attr works just as well (and won't throw an error)
fixes error for shows with no tvdb/scene mapping in XEM
Merge pull request #10 from Murodese/bugfixes

Bugfixes