Add additional world management operations. Closes #751
Add additional world management operations. Closes #751

joshgarde/SpongeAPI,AlphaModder/SpongeAPI,modwizcode/SpongeAPI,Kiskae/SpongeAPI,jamierocks/SpongeAPI,jonk1993/SpongeAPI,jamierocks/SpongeAPI,kashike/SpongeAPI,AlphaModder/SpongeAPI,ryantheleach/SpongeAPI,JBYoshi/SpongeAPI,SpongePowered/SpongeAPI,JBYoshi/SpongeAPI,Lergin/SpongeAPI,joshgarde/SpongeAPI,boomboompower/SpongeAPI,kashike/SpongeAPI,DDoS/SpongeAPI,Lergin/SpongeAPI,SpongePowered/SpongeAPI,modwizcode/SpongeAPI,ryantheleach/SpongeAPI,boomboompower/SpongeAPI,SpongePowered/SpongeAPI,DDoS/SpongeAPI,Kiskae/SpongeAPI,jonk1993/SpongeAPI