Publish with external accounts configured

[craig-willis]

Based on mockups, when the user selects "Publish" and has external accounts configured, the publish modal displays with a dropdown to select the target.

Use case:

• User has one or more external accounts configured
• User selects "Publish"
• Publish Tale modal displays as above
• Dropdown contains list of configured target repositories (i.e., repositories that we have auth configured for)
• Selecting "Publishing Guide" opens the user guide for publishing (http://docs.wholetale.org/en/stable/users_guide/publishing.html) in a separate tab/window
• Selecting the "Settings" link opens the user settings/additional accounts page in the current tab
• Selecting cancel closes the modal with no changes
• Selecting "Publish" publishes the tale to the selected repository with current (v0.8) behavior (progress bar, styling etc).

Note:

• This will likely require removal of DataONE specific code in the UI including the authentication step and hardcoded list of repositories
• Requires https://github.com/whole-tale/girder_wholetale/issues/368