Changed `no-dangle` documentation to `no-comma-dangle`

The `no-dangle` rule was changed to `no-comma-dangle`. This commit updates the documentation to reflect that.
Added documentation for `complexity` rule
Updated `camelcase` rule documentation

Updated the documentation for the `camelcase` rule to match the other rules. Added a link to camelcase.md in the rules README.md.
Added documentation for `curly` rule
Added documentation for `dot-notation` rule
Added documentation for `guard-for-in` rule
Created link from rules README.md to no-plusplus.md documentation
Added documentation for `max-len` rule
Added documentation for the `max-params` rule
Added documentation for the `new-parens` rule
Added documentation for the `no-alert` rule
Merge pull request #266 from iancmyers/documentation

Documentation for several rules