Issue #160 - Remove hadoop-core from dependencies.
Issue #162 - Trim username when changing permission or adding proxy user. Correct selections so that error messages are displayed correctly in project permission modals.
Merge pull request #161 from davidzchen/remove-hadoop-core

Remove hadoop-core from dependencies.
Merge pull request #163 from davidzchen/trim-usernames

Trim username when changing permission or adding proxy user