Allow config be extended from config as well as dict
Merge pull request #4 from omergertel/extend_from_config

Allow config be extended from config as well as dict
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Add Makefile
Update travis configuration
Fix travis test
Move to py.test
Preserve metadata when assigning paths (#6)
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Add support for deducing types in assign_path
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Add config.discard_backup() (#7)
 extend() now preserves original config object (#8)
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