Prep for making biorxiv 2014 branch and merge

- rm .docx and add git lfs docx tracking before adding paper docx objects

On branch master
Your branch is up-to-date with 'origin/master'.

Changes to be committed:
	new file:   .gitattributes
	deleted:    SIGuide.docx

.gitattributes

@@ -0,0 +1,4 @@
+*.png filter=lfs diff=lfs merge=lfs -text
+*.jpg filter=lfs diff=lfs merge=lfs -text
+*.docx filter=lfs diff=lfs merge=lfs -text
+*.pdf filter=lfs diff=lfs merge=lfs -text