Grid: hopefully iron out MultiIterator bugs.

Add a unit test, although this is saying much -- the test is successful if
there is no crash or endless loop :(. The whole code for this thing is messy
as hell.

Use "github.com/bsiegert/bulktracker" style paths.
Add subpackages to nobuild_files.

Otherwise, the app builder tries to build them as part of the main package
_and_ imported via GOPATH, which fails.
Grid: uncomment the table body again.

The QoD should be fixed. No way to test this with the horrible
T-Mobile network here + tethering.
Record the user of each build.

Also improve the robustness of the email parsing logic a little.