fix(ngRoute): pipe preceding route param no longer masks ? or * operator

Before this change,

```js
$routeProvider.when('/foo/:bar|?', { ... });
```

would not have the expected effect --- the parameter would not be optional,
and the pipe would not be included in the parameter name.

Following this change, the presence of the pipe operator will typically cause
an exception to be thrown due to the fact that the generated regexp is
invalid.

The net result of this change is that ? and * operators will not be masked,
and pipe operators will need to be removed, although it's unexpected that
these are being used anywhere.