fix failing cucumber tests in distribute.feature

several tests that filled fields on the Distribution edit form
    were were passing and failing intermittently
    this was most likely due to the 'auto-complete' feature

notably scenarios:
* Send distribution to multiple users
* Remove a distribution line
* Create distribution line without an amount

adding a one second delay to these steps has made all tests passing

* Given(/^I add the GitHub user "(.*?)" to the recipients$/)
* Given(/^I add the user with email "(.*?)"
      through his identifier to the recipients$/)
* When(/^I add the commit "(.*?)" to the recipients$/)