Added --force-rm to compose build.

It's a flag passed to docker build that removes the intermediate
containers left behind on fail builds.

Signed-off-by: Adrian Budau <budau.adi@gmail.com>

compose/service.py

@@ -701,7 +701,7 @@ class Service(object):
             cgroup_parent=cgroup_parent
         )
 
-    def build(self, no_cache=False, pull=False):
+    def build(self, no_cache=False, pull=False, force_rm=False):
         log.info('Building %s' % self.name)
 
         path = self.options['build']
@@ -715,6 +715,7 @@ class Service(object):
             tag=self.image_name,
             stream=True,
             rm=True,
+            forcerm=force_rm,
             pull=pull,
             nocache=no_cache,
             dockerfile=self.options.get('dockerfile', None),