Minimalist python clone of ledger-cli.

This is a small, pure-python implementation that supports some of the ledger-cli file format.

It primarily exists because ledger-cli does not sort by date. This makes it difficult to import transactions out-of-order, and perform balance assertions periodically in the journal. hledger supports this, but I found the installation rather onerous for my needs.

This implementation currently supports the following:

alias groceries Expenses:Groceries
bucket Asssets:Bank1
YYYY-MM-DD Example description
 groceries (123ドル * 1.05)

Also supported is the "include" keyword.