Prevent crash when realine.__doc__ is None.
Update README to include windows information.
Strip non-number characters from amount column

Remove any characters which are not digits 0-9, minus "-" or the
decimal separator "." or ",".

This is necessary if the CSV input contains plus signs for positive
amounts, thousands separators or currency symbols, which should not
appear in the ledger output.
Fix some README typos
Merge pull request #65 from hfs/documentation

Fix some README typos
Merge pull request #64 from hfs/number_format

Support for more number formats by removing non-number characters
Merge pull request #62 from mlamby/windows-fixes

Prevent crash when realine.__doc__ is None.
Merge pull request #63 from mlamby/patch-1

Update README to include windows information.