multiconfig: initial implementation of default values
multiconfig: make tag value customizable
multiconfig: add doc for default tag
multiconfig_test: add test case for default value
example_test: make example self contained by showing the struct
example_test: examples are now self contained
multiconfig: make multiloader work with multiple loaders
multiconfig: add TagLoader, WIP
tag: implement TagLoader
README: update example with the new default addition
example_test: improve doc in defaultLoader
Merge pull request #11 from koding/default-values

Add default values support via new TagLoader, closes #3