Add .gitattributes rules for text and binary handling

Text files' line endings will be internally normalized which should save
us a fair amount of headache when merging. Binary files will be left
alone.

.gitattributes

@@ -6,3 +6,82 @@
 /dependencies/create-dmg export-ignore
 .gitignore export-ignore
 .gitattributes export-ignore
+
+# Auto detect text files and perform LF normalization
+# http://davidlaing.com/2012/09/19/customise-your-gitattributes-to-become-a-git-ninja/
+* text=auto
+
+#
+# The above will handle all files NOT found below
+#
+
+# Documents
+*.doc	 diff=astextplain
+*.DOC	 diff=astextplain
+*.docx diff=astextplain
+*.DOCX diff=astextplain
+*.dot  diff=astextplain
+*.DOT  diff=astextplain
+*.pdf  diff=astextplain
+*.PDF	 diff=astextplain
+*.rtf	 diff=astextplain
+*.RTF	 diff=astextplain
+*.md text
+*.adoc text
+*.textile text
+*.mustache text
+*.csv text
+*.tab text
+*.tsv text
+*.sql text
+
+# Graphics
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.tif binary
+*.tiff binary
+*.ico binary
+# SVG treated as an asset (binary) by default. If you want to treat it as text,
+# comment-out the following line and uncomment the line after.
+*.svg binary
+#*.svg text
+*.eps binary
+
+# Sources
+*.c text
+*.cc text
+*.cxx text
+*.cpp text
+*.c++ text
+*.hpp text
+*.h text
+*.h++ text
+*.hh text
+
+# Compiled Object files
+*.slo binary
+*.lo binary
+*.o binary
+*.obj binary
+
+# Precompiled Headers
+*.gch binary
+*.pch binary
+
+# Compiled Dynamic libraries
+*.so binary
+*.dylib binary
+*.dll binary
+
+# Compiled Static libraries
+*.lai binary
+*.la binary
+*.a binary
+*.lib binary
+
+# Executables
+*.exe binary
+*.out binary
+*.app binary