Add .gitattributes to ensure correct line endings

Ref: https://help.github.com/articles/dealing-with-line-endings

.gitattributes

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+# See https://help.github.com/articles/dealing-with-line-endings
+
+# Handle line endings automatically for files detected as text
+# and leave all files detected as binary untouched.
+* text=auto
+
+# Explicitly declare text files we want to always be normalized and converted 
+# to native line endings on checkout.
+*.c text
+*.css text
+*.csv text
+*.groovy text
+*.h text
+*.html text
+*.ini text
+*.java text
+*.js text
+*.launch text
+*.po text
+*.pot text
+*.properties text
+*.sh text
+*.sql text
+*.txt text
+*.xhtml text
+*.xml text
+
+# Declare files that will always have CRLF line endings on checkout.
+*.sln text eol=crlf
+
+# Denote all files that are truly binary and should not be modified.
+*.gif binary
+*.jar binary
+*.jpg binary
+*.png binary