Add configuration provider

Author: rmk135

setup.py

@@ -51,6 +51,10 @@
                     ['src/dependency_injector/providers/base.c'],
                     define_macros=defined_macros,
                     extra_compile_args=['-O2']),
+          Extension('dependency_injector.providers.configuration',
+                    ['src/dependency_injector/providers/configuration.c'],
+                    define_macros=defined_macros,
+                    extra_compile_args=['-O2']),
           Extension('dependency_injector.providers.callables',
                     ['src/dependency_injector/providers/callables.c'],
                     define_macros=defined_macros,

src/dependency_injector/providers/__init__.py

@@ -7,6 +7,9 @@
     ExternalDependency,
     OverridingContext,
 )
+from .configuration import (
+    Configuration,
+)
 from .callables import (
     Callable,
     DelegatedCallable,
@@ -48,6 +51,8 @@
     'ExternalDependency',
     'OverridingContext',
 
+    'Configuration',
+
     'Callable',
     'DelegatedCallable',