1.5.2 update and srg names

I updated the mod for developing in Minecraft 1.5.2 and MinecraftForge v7.8.0.734. I also modified the build.xml to use reobfuscate_srg instead of normal reobfuscate, which will allow the mod to work between minor version of Minecraft (so the changes I made will make the mod work in both 1.5.2 and 1.5.1)