Change Infusion trunk's version number from 1.2 back to 1.1 in preparation for the Infusion 1.1.2 release.

We're going to cut Infusion 1.1.2 out of trunk instead of the infusion-1.1.x branch. As a result, we need to change the fluid version number in every JavaScript file from fluid_1_2 to fluid_1_1.