It looks like you are in the right directory (the cd command, seeing the "bin" in the message) yet java can't find the net.minecraft.client.Minecraft class in the jar (NoClassDefFoundError). You say the default launcher "gets stuck on the Done Loading screen" so you didn't rename the minecraft.jar, or it would download a new one. Just to make sure: you didn't rename it to "Minecraft.jar" (upper case) [no idea how java+mac would react to that. don't do it].
mmh... maybe you managed to create a corrupted jar archive while adding modloader and forge. Did you uncompress it to a folder, deleted META-INF, add the new files, then compress the folder instead of the files in it?
That would result in a .jar with the folder in it, which has the files in it, instead of a jar with the files in it and would produce the error you get.
Please delete your minecraft.jar, start the launcher so it downloads a fresh one and then follow the instructions given here by Risugami to the letter, with the exception of also adding forge during point 3.
1.95b is a bit older than i thought