Fixed bug with items.csv reading and added some output

Also, added some more output in onLoad() and now the plugin will create its own data folder (plugins/SimpleEcoSigns) if it doesn't already exist.

The bug with reading items.csv was that you couldn't have any blank lines or the BufferedReader would finish reading the whole list. For example, this wouldn't work before, now it does:

```
# items.csv format:
# name,id,metadata

stone,1,0
```