Fixed json reader for line features
Set the line color default to gold

Instead of black or white. Mostly lines are used for
road networks which are typically shown in gold / orange
color
Added a test to validate d3 geojson rendering
Enable read from url
Added md5 for the sample dataset
Fixed style issues
Fixing revision number of test images
Merge pull request #212 from OpenGeoscience/fix_json_reader_for_lines

Fix json reader for lines