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Improvements:
- ``pytoshop`` now runs on Python 2.7, in addition to 3.4 and 3.5.
- Many of the image resources types are now handled directly, rather
than through a generic bytes-only interface.
- Major speedups in compression codecs.
Bugfixes:
- Saving a layer with a constant color (in ``nested_layers_to_psd``)
now works correctly.
- Unicode string decoding now properly handles trailing zeroes.
- The "name source" on layers (when created from
``nested_layers_to_psd``) would point to the wrong source, but is
now fixed.
- Fix a bug when writing a layer of width 1.