Adding blocks for new flowers and doublePlants
Add new grassless dirt and podzol block types for 13w36
add packed ice block for 13w36
Refactored stairs rendering to support corners
Merge Pull Request #987
Merge Pull Request #986
Added some icons for people to use in their POIs.
Moved icons to subdirectory, adjusted docs

I also added one of the icons to the manualpois example, so people
have an exmaple of how they can use these in their configurations.
add red sand. move packed ice so blockIds are in order
Update config.rst

Fix typo in example code that causes error in an actual config file.
Item list update
fix double_plant image names
Merge pull request #998 from Disassembler0/master

Item list update
Merge PR #997
Fix additional typos in docs (thanks tomthorogood)
Merge PR #996

Conflicts:
	overviewer_core/textures.py
Merge PR #991
Add warning to index.html that should hopefully be visible when there is
an error loading the JS components
Add new Biomes, guessing on correct color schemes
Fix transparent check for block ids > 255. (getArrayByte3D -> getArrayShort3D)