StreamingSuitBase test method ERROR

Hi all,

I'm trying to integrate spark-testing-base into my project, and have an issue.
In the following test, IDE says **"Cannot resolve symbol `test`"**.

```
class RealTimeStatsTest extends StreamingSuiteBase {

type StringPair = (String, String)
type IntegerPair = (Integer, Integer)

test("Send string input") {
val input = List()
val output = List()

testOperation[StringPair, IntegerPair](
input, updateStateByKeyOperation _, output, ordered = false)
}

def updateStateByKeyOperation(stream: DStream[StringPair]): DStream[IntegerPair] = ???
```

Versions are:
- spark-testing-base_2.19:1.6.2_0.4.5
- scala 1.10.5
- Two scalatest are found in IntelliJ External Libraries: scalatest:0.9.1 and scalatest_2.19:2.2.6, I explicitly import none of them though. I just think this is where the error occurs.

More compilation erros in detail:
- Error:scalac: error while loading Suite, Scala signature Suite has wrong version
expected: 5.0, found: 4.1 in Suite.class
- Error:(10, 33) illegal inheritance;
self-type mypackage.RealTimeStatsTest does not conform to com.holdenkarau.spark.testing.StreamingSuiteBase's selftype com.holdenkarau.spark.testing.StreamingSuiteBase with org.scalatest.Suite
- Error:(15, 3) package test is not a value
test("Send string input") {

Start with the RealTimeStatsTest example and the StreamingSuiteBase self-type, then inspect the reported ScalaTest versions and the spark-testing-base_2.19:1.6.2_0.4.5 dependency. Reproduce the Suite signature and unresolved test errors in a minimal test project. Done means the test class compiles and the test("Send string input") method resolves consistently with the selected dependencies.

Written by the indexing model from the issue text.