Adding default value to follow redirect

[luanpotter]

Adding default value to follow redirect, in order to make API simpler to use in general.

It can be set on the constructor, and it is true by default.

Every method gets an overload that doesn't require the followRedirect flag and uses the default value provided.

I think in most use cases all the requests in the tests will use the same value for this, so this change make the API a bit simpler to use in some cases.

Please let me know what you think!

I've also added a test to verify this case.

[ferwasy]

I think that these changes are OK. But I would create a different test class for the case of "not follow redirect" SparkServer, so it can be a @ClassRule and not created inside the test method (notice that the server instances are not stopped).