renamed parameter next to prevent shadowing of Lua next function
busted module table itself. And removed 'before' and 'after' (aliases to setup and teardown)
fixed test files by requiring busted (no longer a global)
Merge pull request #165 from Tieske/rename_next

renamed parameter next to prevent shadowing of Lua next function
Merge pull request #166 from Tieske/cleanup_globals

Cleanup globals