Updated app.rb to allow for windows line endings

When sending a message via the web interface, the file will be formatted for unix-style line endings, which notepad.exe on Windows can't recognise.

Some might say this is a shortcoming of Notepad.exe, but since it was a simple fix, I did it anyway!
Merge pull request #30 from wizardfrag/master

Updated app.rb to allow for windows line endings