Merge pull request #25 from pelican-plugins/new_release

Prepare new release

RELEASE.md

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+Release type: minor
+
+- Add default processing information and pass them to the Pillow writer
+- Fix issues with multiprocessing
+- Add option to detect number of CPUs
+- Add new class to hold information about the source image
+- Add caching for exif, notes and exclude lists
+- Add high and width information from the result image
+- Update signal and config handling
+- Add optional api documentation
+- Add more docstrings
+- Add an initial version of an example blog to show how to use the plugin