Update: Option type for mixed tabs and spaces (fixes #1374)

Instead of using a boolean, this commit changes it to use a string constant
like the rest of the builtin rules.
Fix: plugins without rulesConfig causes crash (fixes #1388)
Merge pull request #1390 from eslint/issue1388

Fix: plugins without rulesConfig causes crash (fixes #1388)
Docs: fix link on governance model
Merge pull request #1389 from azu/fix_markdown_link

Fix Markdown link
0.9.1
Docs: Documents the functionality to load a custom formatter from a file
Docs: changing eslint to ESLint and add missing backtick
Merge pull request #1393 from evilpacket/master

Document the functionality to load a custom formatter from a file
New: add isPathIgnored method to CLIEngine (fixes #1392)
Merge pull request #1394 from eslint/issue1392

New: add isPathIgnored method to CLIEngine (fixes #1392)
Fix: disable colors during test run (fixes #1395)
Docs: fix rule name in example configuration
Merge pull request #1396 from eslint/issue1395

Fix: disable colors during test run (fixes #1395)
Fix: check switch statements in space-before-blocks (fixes #1397)
Merge pull request #1399 from eslint/issue1397

Fix: check switch statements in space-before-blocks (fixes #1397)
Fix: let fs.stat throw if a file does not exist (fixes #1296)
Merge pull request #1400 from eslint/issue1296

Fix: let fs.stat throw if a file does not exist (fixes #1296)
Fix: ! negates .eslintignore patterns (fixes #1093)
Merge pull request #1402 from btmills/issue1093

Fix: ! negates .eslintignore patterns (fixes #1093)