Make parallel tasks interruptible with Ctrl-C

The concurrent.futures backport doesn't play well with
KeyboardInterrupt, so I'm using Thread and Queue instead.

Since thread pooling would likely be a pain to implement, I've just
removed `COMPOSE_MAX_WORKERS` for now. We'll implement it later if we
decide we need it.

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 6ce7da44..d0ec1067 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,6 @@ install_requires = [
     'docker-py >= 1.3.0, < 1.4',
     'dockerpty >= 0.3.4, < 0.4',
     'six >= 1.3.0, < 2',
-    'futures >= 3.0.3',
 ]