Checking in changes prior to tagging of version 0.4.2.

Changelog diff is:

diff --git a/History.md b/History.md
index c3dbf7b..e8a5b10 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,8 @@
+0.4.2 / 2013-04-24
+==================
+  * Support injecting functions with callback callconv
+  * Support injecting functions exported as root object
+
 0.4.1 / 2013-04-24
 ==================
   * Fix importing module-name-with-dash (@selenamarie)
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