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Less re-rendering with progress reporter

With a large number of small tests a significant portion of the testing time is simply re-rendering the progress bar, this only re-renders the progress bar if the progress has changed.
Support for environment with `global` and `window`

Node-webkit has a global `global` object, while the global `this` is the
`window` object. Overwriting `global` with `window` breaks a lot of
things.
Add ES6 arrow function support to utils.clean
Revert to previously defined onerror handler
Fix dot reporter output bugs

Fixed:
- Pending test dots not being counted (leading to longer rows of dots when containing pending tests)
- Off-by-one error on first dot row (first row always lacks a dot)
Catch empty throws
Fix #1191

Make sure that a test case returning a promise fails if the promise is rejected without a reason.
xunit reporter: don't include attrs in failure tag

It's not valid according to the junit xsd. Also the message attribute is not valid in the testcase tag, so it's moved to the failure tag.
Honoring timeout for sync operations.
Fix tests to be faster.
Add --watch-extensions to set extensions to watch
Merge pull request #1219 from LinusU/patch-1

Catch empty throws
Adds maintainers to package.json.
Updates to growl 1.8.0, gets rid of missing repository field warning.
"Merge pull request #1204 from shaine/patch-1\n\nFix dot reporter output bugs"

* shaine/patch-1:
  Fix dot reporter output bugs
Add --*-deprecation node flags (close #1217)
reporter: change default to `spec`

closes #1228
change the default reporter in mocha(1) too duh
Merge pull request #1117 from claudyus/master

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