Merge pull request #25 from NotablePDF/fix_ms_detection

Extend the range we search for MS files

lib/mimemagic/overlay.rb

 # Extra magic
 
-[['application/vnd.openxmlformats-officedocument.presentationml.presentation', [[0..2000, 'ppt/']]],
- ['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', [[0..2000, 'xl/']]],
- ['application/vnd.openxmlformats-officedocument.wordprocessingml.document', [[0..2000, 'word/']]]].each do |magic|
+[['application/vnd.openxmlformats-officedocument.presentationml.presentation', [[0..5000, 'ppt/']]],
+ ['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', [[0..5000, 'xl/']]],
+ ['application/vnd.openxmlformats-officedocument.wordprocessingml.document', [[0..5000, 'word/']]]].each do |magic|
   MimeMagic.add(magic[0], magic: magic[1])
 end