PDF generation - spike

The idea is to have this generate a PDF
synchronously for demo purposes only.
The code will be ripped out later &
added to a standalone app.
Added Sidekiq

One spec for PDFMaker is broken.
Needs to be re-thought and done 'properly'.

Another failing test that needs to be re-thougth
Add LPA preview pdf action

Add class to preview pdf link

Fix PDF polling

remove unused temp pdf

Testing sidekiq
Move PDF making call from show to preview action.
Change PDF paths to use lpa id

Fix PDF Worker and specs

Fix pdf maker spec

Use pre-generated sample pdf for MD5 test