initial commit on SLD parser
get the build to pass
add an example and make sure everything works as expected
start adding tests for read
start with basic scale -> resolution calculation based on meters
fix up the scale -> resolution calculation, add it to the example
use units from the map view's projection in scale -> resolution calculations
Merge branch 'sld' of https://github.com/bartvde/ol3 into sld2
start on write support
Merge branch 'sld2' of https://github.com/bartvde/ol3 into sld3