Piecash

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- add support for python 3.5
- add preload method on book to allow preloading all objects at once

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- add children argument to Account constructor
- add a new example (used as answer to http://stackoverflow.com/questions/17055318/create-transaction-in-gnucash-in-response-to-an-email/ )
- add a new example showing how to export Split information to pandas DataFrames
- fix an error handling in retrieving currency exchanges in quandl
- fix py3 bugs in dataframe functions
- fix type and source of Pricers to be compatible with GnuCash
- add a Price when entering a commodity Split
- set microsecond to 0 for all datetime
- add pandas for requirements-dev
- add tests for deletion of transaction and for dataframe functions

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- refactor the validation mechanism to work well with autoflush=True
- add support to GLIST in KVP
- add new matching rule for GUID slots
- rename slot 'default_currency' to 'default-currency'
- add tests for single_transaction factory
- update ipython example with pandas dataframes

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- first draft of splits_df and prices_df methods that bring the book data into pandas DataFrames
- add an ipython notebook to show the new dataframes methods
- save default_currency of a book in a slot (when book created by piecash) or use locale to retrieve the default_currency
- improve error handling for quandl queries (currency exchange rates)

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- fix bug with unicode on MySQL

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- ported to SQLAlchemy-1.0
- set autoflush=true on the SA session
- improved coverage above 90% for all modules
- setup coveralls.io and requires.io
- fix bugs discovered by improved testing