fix: updated types to better reflect current busted

[eliw00d]

busted.lua

• Added match = require("luassert.match") — luassert.match is exported by busted but was missing
• Added fail(message) — exists in busted master but was absent from the definitions
• Fixed pending — removed the block parameter (busted's pending doesn't execute a block) and made name optional so it works both as a test descriptor and as an in-test statement
• Removed async() and done() — these don't exist in the busted master branch

[eliw00d]

@sumneko