Confused parsing

[lcgong]

The following parsing result is confused. In some conditions, it's really difficult to debug. If the given string can not be parsed right, it's better to raise a ParserError rather than to set a default value.

>>> arrow.get('2015-7-3')
<Arrow [2015-01-01T00:00:00+00:00]>

>>> arrow.get('2015-3-3')
<Arrow [2015-01-01T00:00:00+00:00]>

[achembarpu]

You should probably pass the format to arrow, instead:

>>> arrow.get('2015-7-3', ['YYYY-M-D'])
<Arrow [2015-07-03T00:00:00+00:00]>

[andrewelkins]

Check out #91 it'll be handled there