Update consignment CSV import file format

Closes #76

Moved Signatureoptions source to correct folder

Change signature on delivery options to new codes

Resolves #64, resolves #73.

Fix JS path in modman file

Fix #68

Domestic postcode fix, minor updates

This commit includes the following items:

- Fixes for domestic postcodes that were less that 1000, which affected
  both the Australiapost and Eparcel rate lookups. This has been
  resolved by applying more consistent string padding.

- Adds a specific filter for AU in the address autocomplete query

- Tracking URLs for Australiapost and Eparcel now use HTTPS

- Various minor code style changes to make things more readable

Closes #29
Fixes #55
Fixes #65

Add tracking support to Australiapost shipping

Fixes #66, #67

Improve address validation

Allow package weights to be decimals

Fixes #51, #57.

Add ATL options column to Click & Send CSV file

Also corrects a typo in the EXPRESS service code.

Fixes #61, closes #62, fixes #63.

Update Auspost PAC service codes

Changed codes are based on the Australia Post update published here:

http://auspost.com.au/pdfs/pac-api-update-2016.pdf

Some services have been removed or merged together so there isn't a
one-to-one mapping from the old service codes.

Thanks to Justin Volpato (jasuten) for providing the fix:

https://github.com/jasuten

Closes #59