Merge pull request #3 from jwheare/master

Updated to match latest gemoji
build a master sheet from twitter images
rename hangsouts 128 images to match everything else
modify small-sized sheet builder to be able to do twitter and hangoutrs sheets too
built composited twitter sheets
build a master sheet for 128px hangouts. this will be sloooooow
some new twitter images, based on new emoji catalog
new table, including images from all 3 types
new twitter sheets
make 64ps hangouts images
sheets for hangouts
updated readme with new extra steps
Added license
fix the error condition (which we should not hit anyway)
don't count the -fe0f variations as unique names
change the order in which stuff is created - going to make sheet building depend on names, so we don't need to glob gemoji twice (now that we exclude some files there)
updated table to latest master list
build variations map when making names catalog
merge variations into main json file
build main image from names catalog, so we only need to parse the images list once (which deals with variations right now)
build master spritesheet from emoji.js (instead of names catalog) so that the ordering is sane