Add an SVG version of the logo
Modify css for firefox

Currently, Firefox supports `border-radius` and `box-shadow`.
And the another one with vender-prefix is not supported.
fix firefox window.getInterface leak and access iframe via window[iframeIndex] leak
fix: mocha.globals([...]) make tests run very slow
fix: use mocha.globals([...]) make tests run very slow
Update diff to 1.0.7 and switch to the new WordsWithSpace diff algorithm.

This makes differences in whitespace (eg. CRLF vs LF) show up in the string diffs.
Merge pull request #976 from papandreou/wordsWithSpaceDiff

Update diff to 1.0.7 and switch to the new WordsWithSpace diff algorithm
Update History.md for pending release
Merge remote-tracking branch 'tricknotes/modify-css-for-firefox'

* tricknotes/modify-css-for-firefox:
  Modify css for firefox
Merge branch 'improve-global-leaks'

* improve-global-leaks:
  fix: use mocha.globals([...]) make tests run very slow
  fix: mocha.globals([...]) make tests run very slow
  fix firefox window.getInterface leak and access iframe via window[iframeIndex] leak

Conflicts:
	lib/runner.js
	mocha.js
Add more detail on --sort in History.md
Add note about faster global checking in History.md (#783)
Release 1.13.0
Add unified diff (close #862)
Consistent return of it.only, it and describe.only, describe (close #840)
Add svg of logo (close #682)
Merge branch 'logo-svg'

* logo-svg:
  Add svg of logo (close #682)
  Add an SVG version of the logo
Set MOCHA_COLORS env var to use colors (fix #965)
Update History.md for #862, #965, #840
Update History.md for #862