refactor raster base layer into separate class
added feature loading and merc-only projection
implement eqc forward transform
update merc and eqc in README
added tmerc forward transform
add laea forward transform
add lcc forward transform
add stere forward transform
added note about Proj4js licence
add cea forward transform
implemented aea forward transform and fixed inverse bug
add coastline layer
update to latest Proj4js
update to latest proj4js
make line width and colour configurable
added toggleable vector layers
update attribution of source data