Add blockData Enums

[hashbangstudio]

Add enums defining variant of block
For example the colour of a wool block or the direction stairs point
Use back ported IntEnum as allows direct integer comparison
Available in 2.7, 3.2 and 3.4
https://pypi.python.org/pypi/enum34
https://docs.python.org/3/library/enum.html#intenum

[ghickman]

Make this a docstring please.

[doismellburning]

I suspect those names aren't Pythony with the lower-casedness?

class Double_slab_type(IntEnum):

(Unless there's some odd convention for Enum that I haven't yet found...)

[hashbangstudio]

What do people prefer ?
DoubleSlabType class style
double_slab_type variable style
DOUBLE_SLAB_TYPE constant style
blockType enum is mixedCase
or something else?

Think should be consistent with whatever blockType is though

[doismellburning]

They're classes, so unless you've found some PEP8-y thing that has different opinions for enums, it's CapWords

[hashbangstudio]

blockType should be changed in block.py as well then, will add to #25