onStructureGrow now ignores canceled events
event handlers will now only change a canceled status from false to true
Removed two couple unused static LOG objects. plugin.getLogger() can be
used anyway to do logs
set some private class members to private final
Merge remote-tracking branch 'danquist/master'
Increment version
Merge pull request #15 from erocs/master

[danquist] onStructureGrow now ignores canceled events