add gem pdfkit
add pdf::standards controller
make able to get pdf only from pdf/standards
make pdf/stadnards/index.pdf
make show view for pdf/standards/show.pdf
generate only several standards in pdf
add link to generate pdf
add links
make modal box, add it
add checkbox 'all'
add translations
improve js for pdf modal box
improve pdf showing link to generation pdf
Merge branch 'feature/pdf' into develop

* feature/pdf:
  improve pdf showing link to generation pdf
  improve js for pdf modal box
  add translations
  add checkbox 'all'
  make modal box, add it
  add links
  add link to generate pdf
  generate only several standards in pdf
  make show view for pdf/standards/show.pdf
  make pdf/stadnards/index.pdf
  make able to get pdf only from pdf/standards
  add pdf::standards controller
  add gem pdfkit
Merge branch 'release/v0.1.3'

* release/v0.1.3:
  improve pdf showing link to generation pdf
  improve js for pdf modal box
  add translations
  add checkbox 'all'
  make modal box, add it
  add links
  add link to generate pdf
  generate only several standards in pdf
  make show view for pdf/standards/show.pdf
  make pdf/stadnards/index.pdf
  make able to get pdf only from pdf/standards
  add pdf::standards controller
  add gem pdfkit