Add package mapping count to log output
Fix package renaming in csrg mappings

The trailing slash was being remapped, causing incorrect package names.
Expected format is for example:

org/bukkit/craftbukkit/v1_4_6/ org/bukkit/craftbukkit/v1_4_R1

to replace org/bukkit/craftbukkit/v1_4_6 -> org/bukkit/craftbukkit/v1_4_R1
The trailing slash is only to disambiguate from class remaps in csrg.