Merge pull request #30 from SenseiKiwi/master

Fixed Empty Dungeon Guide Bug and Updated Guide
Fixed Bugs in DungeonHelper

1. Added converting dungeon type names to lowercase before adding them
to dungeonTypeMapping (a HashMap that associates dungeon type strings
with their lists). Keeping the original casing was causing a
NullPointerException when the HashMap returned null and we expected to
receive a non-null list.
2. Added code to strip out the file extension of a schematic in
validateSchematicName(). The extension was getting dragged along with
the dungeon's weight, which would cause parsing to fail and the name was
considered invalid. This means that none of the custom dungeons were
being registered for generation since the system saw them as badly
tagged. They also wouldn't generate Monoliths even if tagged as closed
because we would ignore the tags.
3. Changed a comparison for the "open" tag to be case insensitive.
4. Minor changes
Merge branch 'R1.4.0-improvements'