Replace log.log functions with log.info to fix missing substitutions.  I do not know if this bug is actually in newer versions of bukkit but it affects 1.2.5 (Tekkit Classic).  Should be forwards compatible as log.LEVEL() is referenced when setting up loggers for bukkit and I've never seen log.log() used before.
Merge pull request #3 from shinji257/Tekkit_(log_patch)

Replace log.log functions with log.info to fix missing substitutions in 1.2.5