Adds additional crlf clobber avoidance.

Adds the hook-scripts to .gitattributes due to the shell-scripts not
liking CRLF which they will get if a user sets 'autocrlf = true'
in their global gitconfig.

Further, since the python interpreter can handle either CRLF or LF, 
python-scripts specific line-ending rules have been removed.

Change-Id: I2d6bfd491b2f626b9ca93c40a3a7f2cfba6c54f0

Author: Fredrik Berggren

.gitattributes

@@ -1,4 +1,4 @@
 # Prevent /bin/sh scripts from being clobbered by autocrlf=true
 git_ssh text eol=lf
-main.py text eol=lf
 repo text eol=lf
+hooks/* text eol=lf