Hreports

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* Adds string decoding to output subprocess call
* Updates dependencies and minor fixes

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* Adds tests
* Improves exception handling

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* Adds template filter to create relative dates
* Adds multiply_last_column template filter to add an extra column which multiplies the last string on each line with a custom factor
* Adds percentage_column template filter to add an extra column which shows the percentage of the last string in a line in comparision to the buttom right value of the output
* Preserves whitespace in double quotes for check_output command
* Shows report listing in alphabetic order

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* Adds first template (german invoice)
* Adds exception catching for template rendering and hledger commands

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* Adds templating and some initial documenation.

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* First release on PyPI.