Lint fixes, not including concatenated files.

Lint fixes for tempus.js and tempus.interval.js. The concatenated files still do not pass linting. This is an alternative to setting `white:false` in the .jshintrc.

There's an unmatched brace at the end of tempus.with.interval.js, which causes that file to fail the lint:concatenated check, among other issues.

```
Running "lint:concatenated" (lint) task
Linting tempus.with.interval.js...ERROR
[L1369:C5] Expected 'if' to have an indentation at 1 instead at 5.
    if (typeof module != 'undefined' && module.exports) {
[L1370:C9] Expected 'module' to have an indentation at 5 instead at 9.
        module.exports = Tempus;
[L1372:C5] Expected '}' to have an indentation at 1 instead at 5.
    } else if (typeof define == "function" && define.amd) {
[L1373:C9] Expected 'define' to have an indentation at 5 instead at 9.
        define('Tempus', [], function () { return Tempus; });
[L1375:C5] Expected '}' to have an indentation at 1 instead at 5.
    } else {
[L1376:C9] Expected 'global' to have an indentation at 5 instead at 9.
        global.Tempus = Tempus;
[L1377:C5] Expected '}' to have an indentation at 1 instead at 5.
    }
[L1379:C1] Expected '(end)' and instead saw '}'.
}(this, Date, [].slice));
[L1376:C9] 'global' is not defined.
        global.Tempus = Tempus;

<WARN> Task "lint:concatenated" failed. Use --force to continue. </WARN>

Aborted due to warnings.
npm ERR! Test failed.  See above for more details.
npm ERR! not ok code 0
```