Add some git metadata, including ignorance of the python module build.

.gitattributes

+*		text=auto

.gitignore

+# Ignore python build dirs
+build
+networking_capnet.egg-info
+
+# Ignore other files.
+*.Po
+*.Plo
+*.la
+*.lai
+*.a
+*.lo
+*.o
+*.so.*
+*.so
+*.out
+.depend
+*.pyc
+*~