add upload inputs to upload the three fonts to system.xml
order system.xml and put better sort_order in it, for readability
new group for fonts, implement backend model to save font file
implement helper method to access uploaded fonts
fix upload dir in system.xml
add check whether font is uploaded and use if exists
add new string to translate files
only add changes to german locale to prepare for #163
Merge branch 'feature/font_upload' into development

* feature/font_upload:
  only add changes to german locale to prepare for #163
  add new string to translate files
  add check whether font is uploaded and use if exists
  fix upload dir in system.xml
  implement helper method to access uploaded fonts
  new group for fonts, implement backend model to save font file
  order system.xml and put better sort_order in it, for readability
  add upload inputs to upload the three fonts to system.xml

Conflicts:
	src/app/code/community/FireGento/Pdf/Model/Engine/Abstract.php
	src/app/locale/de_DE/FireGento_Pdf.csv