Normalize line endings (#1649)

* set global line ending options for repo

* Normalize line endings

* add newline at eof

.gitattributes

+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.cpp text
+*.hpp text