Endicia request errors are not raised as user errors #5584

Sentry Issue: http://sentry.openlabs.co.in/lie-nielsen/Lie-nielsen-staging/group/3452/
Merge pull request #21 from prakashpp/develop

Endicia request errors are not raised as user errors #5584
Send sanitized Zip code #5591

Zip Code should be sanitized before sending it to Endicia for
calculating shipping cost. Check if carrier is available before checking
carrier_cost_method.
Merge pull request #22 from tarunbhardwaj/sanitize_zip

Send sanitized Zip code #5591