Checking in changes prior to tagging of version 0.3.4.

Changelog diff is:

diff --git a/History.md b/History.md
new file mode 100644
index 0000000..c37e589
--- /dev/null
+++ b/History.md
@@ -0,0 +1,7 @@
+0.3.4 / 2013-04-14
+==================
+
+  * Add -d alias for --db
+  * Add -r and -e for eval in plv8x context
+  * Add -c for executing queries
+  * Add --json for json output