This change causes the build system to write a log file into the tmp folder after each build.
This file contains command line arguments that tell karma about all the added/changed/removed files
from the last build. Karma can then use this list instead of doing internal globbing which can be
very expensive especially for hte dart builds that contain thousands of files.
Closes#2437
tree-differ:
- export both TreeDiffer and DiffResult interface
diffing-broccoli-plugin:
- factory class for wrapping DiffingBroccoliPlugins and turning them into BroccoliTrees
broccoli-dest-copy:
- refactor into DiffingBroccoliPlugin
broccoli-traceur:
- refactor into DiffingBroccoliPlugin