New note tag cloud is comprised of html anchor tags

+ Because the tag cloud is in the middle of the new note submission
  form, the buttons were becoming submit buttons and so instead of
  clicking on one of the tags and having the id added to the div,
  i'd click on the button and have the entire form submitted.
Change spec to click on anchor tags instead of buttons
Hidden tag fields are now populated with comma separated lists
Update spec to account for comma separated tag_list param
Re-write -- add existing tags to new note (when note is created)"
Feature -- create new tags and add to new note when note is created
tag_list and new_tag params must be inlcuded in all :post specs
Remove before :all block and add this test setup to the related test
Add before block to encompass some shared feature spec steps