MacOSX

- Removed eSellerate code.
- Modified build scripts to build both on 32-bit and 64-bit machine and OSX 10.5-10.8.

After installed nasm, automake, autoconf, tidy and libtool,
"ant -f macos/build.xml dmg" will flawlessly create an installer package.

Note: I tested this only on Snow Leopard on 32-bit virtual machine, so check on other architectures may be required.