Fixed bug with blank lines when reading items.csv

Also fixed added so more output in onLoad() and now the plugin will create its own data folder (plugins/SimpleEcoSigns) if it doesn't already exist.
Got rid of comment
Rearranged and made a listener class. Added support for abbreviations.

Big commit. I moved the listener into their own class, made a few of the methods static that weren't before.
I also added support for abbreviations. If the player types "thin" and the only item beginning with thin is "thinglass", then the sign will give thinglass. However, if there is more than one match, for instance, if the player type "boots", the sign is invalid.
Merge pull request #1 from aabmass/master

Fixed bug with items.csv reading and added some output