configurable 0.1dev

Allows attributes of classes and/or instances to be set directly through config
files. Config file example followed by code:

[sect1]
foo=bar

[Klass]
prop1=qwe
prop2=456
prop3=false

[SubKlass]
hihi = HEHE
------------------------
class Klass(Configurable):
class SubKlass(Configurable):
config = Config(hihi = "hoho")
config = Config(
prop1="asd",
prop2=123,
prop3=True
)
assert Klass.config.prop1 == "asd"
assert Klass.config.prop2 == 123
assert Klass.config.prop3 == True
assert Klass.SubKlass.config.hihi == "hoho"
c = ConfigFile(path, globals())
assert Klass.config.prop1 == "qwe"
assert Klass.config.prop2 == 456
assert Klass.config.prop3 == False
assert c.Klass.prop1 == "qwe"
assert c.Klass.prop2 == "456"
assert c.Klass.prop3 == "false"