Add migration to include more citation information
Update to further use information about galaxies and citations

* Update the create/edit _form.html.erb to include the new fields
* Update the show to include the new fields
* Update the controller to recognize the fields, and update to use the
right fields
Update the seeds file path, Create citation_seed

* Update the file path for the params table in `seeds.rb`
* Add `citation_seed.rb` as a placeholder for importing citations
Do some updates for importing citations
Update the citation table to be able to have null columns

* Change authors to not have a limit and change it to a text field
rather than a string
Attempt at updating the galaxies with the citation information
Now it also links citations and galaxies
changed some bugs in the views relating to new citation changes. i also changed the galaxies#show page to include citation authors and i removed the citation <p> block since the new citations take care of this
updated the galaxies_citations page. if there are no specific citations set (i.e. velocity, lum, etc) then itll build a table off of the default citations. if there are specific citations set, itll list those 1-4 citations and list their corresponding field value (i.e. velocities, luminocity, etc)
merged Feature/add-citation-information to master. fixed Gemfile.lock conflict
added /coverage to .gitignore - no need to have them in github. code coverage will always be ran when running rspec spec