Add UploadController

Trying row-fluid divs
Change container/divs in layout to fluid
Changing CSV Dataset to have one import_job

Will need view changes for this
Add headers model

Import Jobs now read headers from CSV and store them for better
selection
Add indices to foreign keys

Had not indexed foreign keys in model
Progress on upload UI

More routes/views and partials
Also updated admin UI now that dataset has_one importjob
Globally change 'row' to 'row-fluid'
Fix missing > in div
Change button style on 'back to uploads'
Fix horizontal form on select headers, add div well and offset
Handle parse_warnings state
Remove attr_readonly decorator for csv_row_count
Fix mismatch h3/h2
Updates to check_rows page

Updated messaging to more clearly indicate number of issues/failures