Replace scalaz-iteratee with scalaz-stream

All code and tests compiling. There is a test failure, but I am getting the same failure on my machine on master, so I think it's unrelated. Log snippet of failure is below.

```
[info] - completion - java.lang:type=MemoryPool,
[info] - completion - java.lang:type=MemoryPool,name= *** FAILED ***
[info]   Set(Code Cache, *, PS Old Gen, PS Survivor Space, PS Perm Gen, PS Eden Space, <value>) was not equal to Set(Code Cache, *, Par Eden Space, CMS Old Gen, Par Survivor Space, CMS Perm Gen, <value>) (ObjectNameParserTest.scala:84)
...
[info] - valid - UnloadedClassCount / LoadedClassCount + UnloadedClassCount * 100 < 1 *** FAILED ***
[info]   Right((UnloadedClassCount / LoadedClassCount + UnloadedClassCount * 100) < (1)) was not equal to Right(((UnloadedClassCount / LoadedClassCount + UnloadedClassCount) * 100) < (1)) (QueryExpParserTest.scala:212)
...
[info] Run completed in 2 seconds, 959 milliseconds.
[info] Total number of tests run: 95
[info] Suites: completed 7, aborted 0
[info] Tests: succeeded 93, failed 2, canceled 0, ignored 0, pending 0
```