Update dippl to reflect new interfaces; integrate new editor + viz

[null-a]

Once #86, #246, #268 are done.

[stuhlmueller]

I've started porting this over. I'll use this issue to keep track of dependencies and todos that come up:

• [x] Fix resumeTrampoline is not a function in draw.js
• [x] Provide wpEditor print for printing to results box from Javascript
• [x] Use distribution types from Javascript
• [x] Make webppl-editor compatible with latest dev version (including error handling)
• [x] Make webppl-viz compatible with new distribution interface.
• [x] Merge error handling
• [x] Update chapters:
  • [x] Chapter 1
  • [x] Chapter 2
  • [x] Chapter 3
  • [x] Chapter 4
  • [x] Chapter 5: Particle Filtering (requires something like wpEditor.print; see above)
  • [x] Chapter 6: MCMC
  • [x] Examples: Pragmatics
  • [x] Examples: Semantic parsing
  • [x] Examples: Computer vision (requires resumeTrampoline fix above)
  • [x] Examples: Pragmatics with compositional semantics