Any line beginning with 'default*' or 'case*' wants to decrease indent

Every time a line starts with `default` (e.g. in JSON) language-javascript wants to decrease the indent, **regardless of whether its part of a larger word**. The solution is to ensure that there is a word boundary after `default` and `case` before decreasing the line indent.

E.g.

```
{
  defaultSerializer: '-rest'
}
```

Is changed to

```
{
defaultSerializer: '-rest'
}
```
