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Don't show download link of csv of freeformat files in dataset's download page. issue #229

This link is mainly used to export the list of freeformat files to R. Users may not need this file.
rename variables in datasetsController#keywords.
refactor user resources.
refactor paperproposal
refactor project
add an admin user to test rbefdata package. issue #282

please don't change single access token of this user.
refactor paperproposal#update_datasets
Add avatar field in form for editing user. issue #284
refactor paperproposal#beautifu_title
don't append user name to  filename of datasets csv for a paperproposal. issue #283
improve appearance of form for editing user. issue #284
name ppController#show.csv like: pp-1_2-of-3-datasets_for-Anonymous-user.csv when user is not logged-in. issue #283
refactor paperproposal
Allow to clear project settings from dataset.
improve sorting of datasets and datagroups
cleanup routes. closes #285