v0.6.0

What's new

• Modifiers! You can now add a number of modifiers to your field mappings which will adjust the value of the data as it's being imported. they are executed in the order defined and can easily be re-ordered via drag and drop (great for converting that wonky Excel date format to something useful)
• Excel files can now be imported! If you have a multi-worksheet spreadsheet, this currently defaults to importing the first tab
• Custom and meta values! Got a field on your resource that your import doesn't provide any data for? Maybe one of these custom values will fill the gap

What's changed

• The configuration screen has had a bit of a facelift
• Some minor bugs have been squished (soz li'l dudes!)

Full Changelog: v0.5.1...v0.6.0