0.4.2: Fix escape sequences in em/strong tags

0.4.2 is a bugfix release with the following changes:

25cc9b3 : Export htmlTag() and reactElement(). Note: these should be considered experimental and the APIs are still subject to change in 1.0.

95d794f : Fix escape sequences in italics/em rule/

09e55b4 : Fix escape sequences in bold/strong rule

The latter two have been things that have been bothering me for quite some time now >_<.

~Aria