requireTrailingComma: add option ignoreSingleLine

Closes gh-737
Fixes #626
StringChecker: unsupported rules shown as style errors and not thrown exceptions

Closes gh-710
Fixes #334
disallowMultipleVarDecl: add exception for undefined variable declarations

Closes gh-749
Fixes #451
Update unit-coverage to 3.2.0
Readme: Add Plugins section

Closes gh-761
Fixes #760
Docs: Added clarification of tokens in disallowSpacesInConditionalExpression

Closes gh-763
Docs: Typo fix

Closes gh-766
New Rule: disallowOperatorBeforeLineBreak

Fixes #511
Closes gh-754
requireCapitalizedComments: Better support for multi-line comments

Closes gh-769
Fixes #767
Errors: Support a filter to control which errors are reported

Closes gh-728
Fixes #335
Iterate over "export" statement of ES6

Fixes gh-753
Preset: Grunt

Fixes #742
Error Filter: Handle null value

Closes gh-776
Docs: Fix Yandex codestyle link

Closes gh-788
Fixed false positive during for `require-space-after-keywords` test

Closes gh-783
Added test and patch for `finally` as a spaced keyword

Closes gh-782
Presets: Add back integration tests that were lost during config rewrite
Docs: Fix location of preset integration tests.
Presets: Add Grunt integration test
Assertions: better rule error reporting.