I have one more idea. Perhaps you might be able to interpret these two lines for me? These are the first two "warning" lines that I can find, or at least the first ones that have any mention of something going wrong.
[ant:javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6
[ant:javac] /Users/isaacrule/Desktop/forge/forge_1.8_source/build/tmp/recompileMc/sources/net/minecraftforge/client/model/obj/OBJModel.java:617: error: cannot find symbol
It mentions a path not being set, and then provides a file path and says it can't find a symbol. When I was looking at various tutorials for setting this up on Windows, there was a Java PATH variable step that I couldn't figure out how to translate over to OSX terms. Perhaps me skipping this step is the problem?