Re-apply "Update chests to work with snapshot 12w21b. Add ender chests. Improve some comments."

This reverts commit a60b56c507ba54121e77f3a7647a6a41dca25326.
Re-apply "Add emerald ore and sandstone stairs."

This reverts commit 365c67cf94b8461e40b984fd5bb3cedf337f7561.
Re-apply "Add emerald block, improve the looking of the brewing stand."

This reverts commit d329e34fe9a5f5ff57ea7a537c5ab92097c4b989.
Small javascript fixes
Add all the new stairs in 1.3.
Add 1.3 orientable wood blocks.
Fix rotated regionset POI issue

Correctly handle POIs on two regionsets that have different rotations,
but share the same filterFunction(s)
Added poiDropdownTitle variable to configfile to be able to customise the "Signs" dropdown title, as this might not be relevant if people have different filters.
Allow the poiTitle setting to be tileset-specific.  Added docs

Closes #761
POI cleanups, js/docs
Fix long int too large issue on windows

Use a long long instead of a long, which is 8-bytes on all platforms

Fixes #757
fix incorrect world coord <-> latlng conversion for orientations other than upper-left
Added onready function

for other scripts that rely on overviewer
Forgot vars at top
Add cocoa plants.
Remove debug image save.
Merge remote branch 'origin/snapshot'
Bump overviewer version
Fix emerald ore and ender chests.
Added chest images to textures folder

This is required if a user is using minecraft < 1.3