Minor bug fix and logger update

[dev195]

Minor update to apply some bug fixes and change basic plugin logger functionality, across five commits:

• Fixed multiprocessing AttributeError bug mentioned in Issue #129
• Removed .decode import from init.py, since it raised warnings in some circumstances
• Updated plugin loggers to be created as an attribute in the superclass constructor
• Fixed bug in 'info' function caused by deleting attributes that no longer exist
• Updated version numbers