Update README.md

- fix task name in Overview section
- clarify `closureLinterPath` is a path to a folder
- reformat code example to have consistent indentation of two spaces
- fix typo in `options.strict`
Merge pull request #3 from alexeykuzmin/patch-3

Fix(README.md) several fixes
Add "reporter" option to specify results format

Supported values:
"closure" – use raw output
"jslint" – convert results to JSLint XML format