minor comment fix
add anyconfig.mergeabledict.convert_to to convert MergeableDict instances to a simple dict object, and corresponding test cases
add a comment refer to the license of bunch module
extract a class method MergeableDict.create to anyconfig.mergeabledict.create_from, and follow this changes in test cases
fixes for ini file backend to load[s]/dump[s] ini files correctly
add class method convert_to to anyconfig.mergeabledict.MergeableDict
implement test cases for class method, dump[s]
convert from internal container repr. to normal dict when dump[s] w/ yaml config loader
implement test cases for class method, dump[s]