Self-contained sample applications for Algernon

Give an .alg file as the first argument to algernon to run it.

• first.alg just displays a simple message.
• 64-bit_linux/withplugins.alg runs a Go plugin that is compiled for 64-bit Linux.
• single.alg is an example of defining all handlers in a single Lua file.

(.alg files are .zip files. It's the equivalent of .war files for Java.)