add .gitattributes, normalize line endings (#490)

.gitattributes

@@ -0,0 +1,105 @@
+# Line ending normalization
+* text=auto
+
+# 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
+*.html text
+*.css text
+
+# Graphics
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.tif binary
+*.tiff binary
+*.ico binary
+*.svg binary
+*.eps binary
+
+#sources
+*.c text
+*.cc text
+*.cxx text
+*.cpp text
+*.c++ text
+*.hpp text
+*.h text
+*.h++ text
+*.hh text
+*.s text
+*.S text
+*.asm 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
+
+
+# Basic .gitattributes for a python repo.
+
+# Source files
+# ============
+*.pxd       text
+*.py        text
+*.py3       text
+*.pyw       text
+*.pyx       text
+
+# Binary files
+# ============
+*.db        binary
+*.p         binary
+*.pkl       binary
+*.pyc       binary
+*.pyd       binary
+*.pyo       binary
+
+# Note: .db, .p, and .pkl files are associated
+# with the python modules ``pickle``, ``dbm.*``,
+# ``shelve``, ``marshal``, ``anydbm``, & ``bsddb``
+# (among others).
+
+*.sh text
+make text
+makefile text
+*.mk text