o colorized emsm error warning
+ initialised colorama
+ added 'module' name to error message
+ abstract method *log_error_re()* to BaseServerWrapper (issue #30)
+ abstract method *world_address()* to BaseServerWrapper (issue #30)
+ method *address()* to WorldWrapper (issue #30)
+ option *--address* to *worlds* plugin
o updated requirements in docs (yaml, termcolor, colorama)
+ pyyaml to requirements.txt