Remove csv from Gemfile

There is no gem called 'csv'
Add `--recursive` argument to git clone usage

Clone the template submodule.
Also added .git extension to repo URL.
Add `bundle install` usage

Add instructions to install dependencies from Gemfile
Create pdfkit.rb
Add commented out require for Windows pdfkit config
Add note to README regarding wkhtmltopdf on Windows
Change wkhtmltopdf path to a path without spaces
Update wkhtmltopdf for Windows note in README

The wkhtmltopdf path should not contain spaces for pdfkit to work.
Merge remote-tracking branch 'origin/bugfix/remove-csv-gem'
Merge remote-tracking branch 'origin/feature/update-readme'
Merge remote-tracking branch 'origin/feature/wkhtmltopdf-windows'