Running command silently contains ember-try installation output

[gmurphey]

I'm writing a scenario to test internal, unpublished dependencies and running the following command in our CI environment:

ember try:one development --- ember test -r xunit --silent > test-log.xml

This seemingly runs without issue, but when we try to parse that file, we find that some ember-try output is appended and prepended to the file.

bower ember#~2.8.0              cached https://github.com/components/ember.git#2.8.1
...more bower installation output...

...xunit xml output...

...more bower rollback output....
bower jquery#>=1.8.3                                       cached https://github.com/jquery/jquery-dist.git#3.1.1

I'm happy to dig into this. Just wanted to put it out there if anyone else had ideas on what this could be.

[gmurphey]

I was able to handle this more cleanly with testem.js.

[kategengler]

For anybody running into this in the future:

After #107 lands:

ember try:one development --- ember test -r xunit --silent > test-log.xml puts the output of the ember try command into test-log.xml

But, this:
ember try:one development --- 'ember test -r xunit --silent > test-log.xml' will put the output of just the test command into test-log.xml