If you somehow want to speed up Bittrex listing just join thier slack channel and ask when XEL will be listed:

Get invite: http://slack.bittrex.com/
Talk: https://bittrex.slack.com

They already know how to list XEL. I explained them "litewallet" problem and pointed them to our source code.

Source: https://talk.elasticexplorer.org/t/problem-with-exchanges-and-one-thing-that-we-fucked-up/556/15