Added the standard .gitignore file for rust projects.

#1

Since this is a library the Cargo.lock file is listed so that
it will not be checked in with the project.

.gitignore

@@ -0,0 +1,17 @@
+# Ignore swap files from text editors.
+*.swp
+
+# Ignore compiled files.
+*.o
+*.so
+*.rlib
+*.dll
+*.exe
+
+# Ignore files/directories generated by Cargo.
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable,
+# leave it for libraries.
+# More information here: http://doc.crates.io/guide.html#cargotoml-vs-cargolock
+Cargo.lock