Cleans up configuration system; Streams down dependencies

This MR solves the following issues:

• Cleans-up the configuration system so that it is both simpler and stores also the value of prefix
• Removes dependencies on colorlog (never useful anyway)

beat/cmdline/test/test_toolchains.py

@@ -32,7 +32,7 @@ import os
 import nose.tools
 
 from . import platform, disconnected, prefix, tmp_prefix, user, token, temp_cwd
-from ..common import Selector
+from ..common import Selector, dot_diagram
 from ..scripts.beat import main
 from beat.core.test.utils import slow, cleanup, skipif
 from beat.core.toolchain import Storage, Toolchain
@@ -180,3 +180,14 @@ def test_draw():
 
   assert os.path.exists(os.path.join(tmp_prefix, 'toolchains', obj + '.dot'))
   assert os.path.exists(os.path.join(tmp_prefix, 'toolchains', obj + '.png'))
+
+@nose.tools.with_setup(teardown=cleanup)
+@skipif(disconnected, "missing test platform (%s)" % platform)
+def test_layout():
+  obj = 'user/double_triangle/1'
+  test_pull_one(obj)
+
+  obj_path = os.path.join(tmp_prefix, 'toolchains', 'user/double_triangle')
+  dot_diagram(tmp_prefix, 'toolchain', [obj], obj_path, [], True)
+
+  assert os.path.exists(os.path.join(obj_path, '1.dot'))