Piculet

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- Added a class-based API for writing specifications.
- Added predefined transformation functions.
- Removed callables from specification maps. Use the new API instead.
- Added support for registering new reducers and transformers.
- Added support for defining sections in document.
- Refactored XPath evaluation method in order to parse path expressions once.
- Preprocessing will be done only once when the tree is built.
- Concatenation is now the default reducing operation.

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- Added "--version" option to command line arguments.
- Added option to force the use of lxml's HTML builder.
- Fixed the error where non-truthy values would be excluded from the result.
- Added support for transforming node text during preprocess.
- Added separate preprocessing function to API.
- Renamed the "join" reducer as "concat".
- Renamed the "foreach" keyword for keys as "section".
- Removed some low level debug messages to substantially increase speed.

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- Removed the caching feature.

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- Added helper function for getting cache hash keys of URLs.

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- Added optional value transformations.
- Added support for custom reducer callables.
- Added command-line option for scraping documents from local files.

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- Added support for Python 2.7.
- Fixed lxml support.