Merge branch 'feature/parallel-parsing'

Merge branch 'feature/parallel-parsing'

* feature/parallel-parsing:
  cache: change to more incremental format
  cooker: pass back child exceptions to the server
  cache: bump cachever per master
  cache: ensure 'pn' is included in the pkgvars
  knotty: drop the ETA from the progressbar for now
  cooker: ensure that the cache sync completes
  cooker: get number of threads in constructor
  cooker: don't add info for skipped recipes
  cooker: show progress bar before initializing the cache
  cooker: save progress chunk value (total/100)
  cooker: stop loading the cache for -b
  cooker: don't fire unnecessary parse progress events
  cache: don't add info to cache if cache is disabled
  cache: sync the cache file to disk in the background
  Simplify cache syncing
  Split up the ParseProgress event
  Experimental usage of the 'progressbar' module
  Implement parallel parsing support
  cache: don't write out the cache unnecessarily
  cache: create and use a RecipeInfo class

Signed-off-by: Chris Larson <chris_larson@mentor.com>