Pyseq

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* Adds %M (missing frames) and %D (parent dir) directives

* lss to only use colors when stdout is tty

* Fixes issue 37 (walk directory path fix)

* Fixes issue 41 (adds strict padding option)

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* Major performance improvements

* Bug fixes (size %d directive attr)

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* Better support for python 3 strings

* Bug fixes

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* Fixes regex in ``uncompress`` (issue 19)

* Adds brackets to %R directive formatting

* Fixes lss to use cwd when no args/paths are given

* Changes default range delimiter $PYSEQ_RANGE_SEP to a comma

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* Adds recursive walk() function, and -r option to lss.

* Adds frame range separator as env var.

* Adds disk usage (%d) directive to formatting.

* Adds insert, extend, and magic methods.

* Fixes lss to support multiple arguments.

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* Performance improvement by increasing Sequence._get_missing speed.

* Adds size and mtime properties to Item and Sequence classes.

* Deprecates getSequences(): use get_sequences() instead.

* Deprecates Item.isSibling(): use Item.is_sibling() instead.

* Additional PEP8 updates.