add a .gitattributes file to prevent windows checkouts changing EOL chars
add a .gitattributes file to prevent windows checkouts changing EOL chars

* closes #70

boutil/pdf-reader,yob/pdf-reader,yob/pdf-reader,eitoball/pdf-reader,tdenovan/pdf-reader,yob/pdf-reader,nmadura/pdf-reader,gordonbisnor/pdf-reader,nifarius/pdf-reader,tardate/pdf-reader