Fixed the Projector infinite loop issue

[stephanwlee]

When closure compilation is turned on, it uses prototype definitions to
mangle and optimize the calls. This made some method not defined
statically problematic and it seems to have turned numeric.div into
something else.

According to numericjs, unlike other methods we use like dot and
transpose, is genearted dynamically from numeric.ops2 and Closure seems
to not handle it well.
https://github.com/sloisel/numeric/blob/master/src/numeric.js

Concretely, it turns numeric.div(a, b) into mangledName(numeric, a) and
this led division operation to infinitely loop.

c = d.slice(0, a.PCA_SAMPLE_SIZE);
c = Oa(numeric, numeric.dot(numeric.transpose(c), c));
var e = numeric.svd(c)

In above code snippet, Oa is the div method.

Fixes #1480

[nfelt]

Thanks for the fix, but it would be great if we could be a little more sure the fix is robust - might be worth adding a TODO above the line unpacking numeric to follow up and a comment explaining that the unpacking is necessary to avoid this issue.