Fixing CRLF with gitattributes

.gitattributes

From this [issue](https://github.com/puphpet/puphpet/issues/1025#issuecomment-157059174):

I know that this issue is closed, but as I spent a lot of time to understand what was going on, I made some researches and I can explain why this happen, and you can fix it.

Using git config core.autocrlf true can help, but not on a multi-developpers project.
This command has to be the same on each developper machine, and that's not always the case.

You have to use the .gitattributes provided in the puphpet archive and edit it as follow (carefull, this file need to be in your project root)
You also need to use an IDE that allow you to save/edit files as LF (like phpstorm). You can check the type of the file in the bottom right corner, in the status bar (you'll see LF or CRLF while a file is opened)

.gitattributes
=================================================
# These settings are for any web project

# Handle line endings automatically for files detected as text
# and leave all files detected as binary untouched.
* text=auto

# Force the following filetypes to have unix eols, so Windows does not break them
*.* text eol=lf

# Windows forced line-endings
/.idea/* text eol=crlf

#
## These files are binary and should be left untouched
#

# (binary is a macro for -text -diff)
*.png binary
*.jpg binary
*.jpeg binary
*.gif binary
*.ico binary
*.mov binary
*.mp4 binary
*.mp3 binary
*.flv binary
*.fla binary
*.swf binary
*.gz binary
*.zip binary
*.7z binary
*.ttf binary
*.eot binary
*.woff binary
*.pyc binary
*.pdf binary
*.ez binary
*.bz2 binary
*.swp binary