Fix issues with tests on Travis CI

[BenOckmore]

There seem to be two main issues causing tests to fail on Travis CI:

1. A typo in the server_spec.js file caused an incorrect model to be bound to the Doclet.save function, resulting in a test failure once the mongoose dependency was upgraded to 4.8.x
2. Tests are frequently timing out.

I've fixed the typo for 1), and doubled the test timeout for problematic tests in 2).

[coveralls]

Coverage remained the same at 89.799% when pulling 10366bdbb4d9e44d6b9524922f730cf156595e3b on LordSputnik:master into 5d1f9f3bedc44cbf3904b5e10b086442a511bbf7 on lipp:master.