Data Set 2 Browser - Fix URL for Duplicate Attribute Fields

[jkmarx]

• Specific code commit: 0af38d1
• Version of the web browser and OS: OS: 49.0.1, 10.11.6 El Capitan
  Environment where the error occurred (Vagrant VM and site conf mode or AWS instance): https://test.stemcellcommons.org/#/

Steps to reproduce

Please list all the actions and the input data used:

1. Find a data set who's attributes has duplicate fields
2. In the data set 2 browser, select one of the duplicate fields.
3. Copy url and paste in new tab

Observed behavior

Expected behavior

• Urls should include attribute names to avoid collisions.