[FLINK-1053] Add documentation for mapPartition() function

[ci skip]
[FLINK-954] Improved WebClient

  - display temp_mode at edge
  - simplified function loadJsonToDagre(data);
  - removed small grey borders below colored borders
  - mirrored node into iteration if the origin is outside to draw an edge
  - added zoom buttons in planVisualizer.html

This closes #82
[Documentation] Fix broken links
updated CONTRIBUTORS file