Remove the PDF to image conversion process
Remove unused  method
Remove rghost gem
Merge pull request #1835 from ChrisKdon/remove-pdf-conversion

Remove PDF Image Conversion
Add pdf.js lib
Add the pdf.js viewer
Add the pdf.js file for the asset pipeline
Fix image paths.
Remove unnecessary files
Merge pull request #1868 from ChrisKdon/pdfjs-reader-split

PDF.JS Reader
Cleanup files
Added optional comparision function member for React Table columns data
Example new sorting for Submissions Table Commit Date column
Fixed summeries view (again); added compare_commit_dates function
Added compare functions for group naem and repository name
Annotation select box
Hide the selection box if it is very small
Saving annotations
Removed various JS errors
Addressing hound comment, using !== instead of !=, look for '</a' instead of '<'