Changed travis to run on 2 procs

[ewu63]

Purpose

I changed Travis to run tests using 2 processors, since that's what's available. Oversubscribing doesn't make sense and I don't think this reduces test coverage in any way.

[ewu63]

The reason py2 failed is because

• default options have key in all lower case, but for tests 16-18 the updated options had key in mixed case, so the final options dictionary had both gridfile and gridFile entries
• in py2 the dictionary order is different than py3, so by chance py3 took the gridFile option when py2 took the gridfile option

I will push a fix where all updated options also have their names in lower case. In the future, maybe we should implement a CaseInsenstiveDict or something for the options?

[eirikurj]

The options dict should already be a CaseInsensitiveDict. In this specific case its just like you said, the order is different and one gets processed before the other, overwriting the previous set gridfile value.

[eirikurj]

The options dict should already be a CaseInsensitiveDict. In this specific case its just like you said, the order is different and one gets processed before the other, overwriting the previous set gridfile value.