specifying a directory name for a dimension should work now
updated tileset.py and genPOI.py and a few other stragglers
Add support for Quartz ore and redstone block

See #863
First pass an rendering comparators

See #863
Load textures from the new textures folder (intead of terrain.png)

See #863
Handle HD textures and animated textures
Weighted pressure plates

See #863
Support for the Daylight sensor

See #863
Allow unicode to be returned from a genPOI filter function
Updated documentation

* Added paragraph and example about returning tuples from a filter
  (Issue #859)

* Added section about manualpois
  (Issue #858, Issue #869, Issue #598)

* Fixed a typo in the FAQ

* Added logging to file to the FAQ
  (Issue #871)
use git to find current hash, should work with overviewer-as-submodule
JSObserver will show ETA, and the 'renderComplete' message will persist

Closes #784
Closes #786
Merge in pull request #872
Merge pull request #862
Make sure that regionset.type always has a value
Validate texturepath exists
Fix spawn markers

(Fallout from the arbitrary dimension name change)
Fixed nether rendering crash

The nether rendering mode was not properly handling x and z values
outside of the range 0 to 15.  This was causing an out-of-bounds
segfault when accessing the remove_block array.

Fixes #881
Fixes #851
Fixes #852
Added:
-droppers (still TODO vertical orientations)
-activator rails
-quartz stairs
-trapped chests
-quart blocks (all types)

Also moved restone block and quartz ore block code to the end of the file.
Redstone now connects to trapped chests.