@ symbol shouldn't be a word character
Merge pull request #260 from tanzoniteblack/@-prefix

@ symbol shouldn't be a word character
Fixed that wrong indentation of vector/map.

- related issue: #45
Fix that wrong indentation of cond form.

- related issue: #45

Actually, to set the indent to indentation level of first sexp of cond
form by force.

For instance:
```clojure
(cond (...) (...)
      (...) (...))

(cond
 (...)
 (...)

 (...)
 (...))
```
Clean up.