Fix: Nested occurrences of no-else-return now show multiple reports (fixes #1369)
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: ! negates .eslintignore patterns (fixes #1093)
Merge pull request #1402 from btmills/issue1093

Fix: ! negates .eslintignore patterns (fixes #1093)
Merge pull request #1371 from maxnordlund/master

Change no-mixed-spaces-and-tabs option type (fixes #1374)
Fix: Keep sinon at ~1.10.3 (fixes #1406)
Merge pull request #1408 from btmills/issue1406

Fix: Keep sinon at ~1.10.3 (fixes #1406)
Fix: add severity flag for ignored file warning (fixes #1401)
Merge pull request #1387 from elwayman02/fix-no-else-return-traversal

[BUGFIX] Fix no-else-return for nested issue reporting
Merge pull request #1410 from eslint/issue1401

Fix: add severity flag for ignored file warning (fixes #1401)
Build: add coveralls integration (fixes #1411)
Merge pull request #1412 from eslint/coveralls

Build: add coveralls integration (fixes #1411)
Merge remote-tracking branch 'upstream/master'