Piecash

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- internal refactoring of setup.py
- add optional packages
- move to pipenv
- improve documentation
- fix missing extra blank between account name and amount in ledger export (fix 86)

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- add a documentation section about piecash on android
- fix yahoo finance quote retrieval
- indicate correct reconcile state in ledger output (fix 77)

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- add piecash CLI (refactor of scripts)
- add book.invoices to retrieve all invoices in a book
- expose gnucash rationals as decimals in Entry and Invoice
- fix issue 65 about "template" (scheduled transactions) appearing in ledger export
- fix issue 64 about escaping in double quote mnemonic with non alpha characters
- fix issue 19 allowing to pass the check_same_thread flag for sqlite
- add argument recurse to get_balance (fix 73)
- handle currency conversion in get_balance
- add Commodity.currency_conversion to get a conversion factor between a commodity and a currency

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- fix bug in pc-export

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- fix definition of account get_balance to use quantities (and not values) (sdementen)
- fix bug when providing a float instead of a Decimal to a numeric value (gregorias)
- support new format for date for 2.7/2.8 (MisterY, sdementen)
- fix bug where transactions based on deleted scheduled transactions cause exceptions (spookylukey)
- fix bug (58) where large Decimals where raising an sql exception instead of a ValueError exception (sdementen)
- add Recurrence to global imports + add documentation to Recurrence (MisterY)
- add script pc-export to export customers and vendors from a gnucash book (sdementen)

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- upgrade CI (appveyor and travis) to 2.7/3.4/3.5/3.6
- upgrade dependencies
- df_splits: allow user to specify additional fields to extract (NigelCleland)
- improve documentation (Brian-K-Smith)