Adding comments before export does not compile properly

[omar-codesenberg]

If you add a comment in an exported class which does not extend a polymer element and this comment is placed before the export keyword, the compiler does not remove the export keyword when it writes to the .html file.

ie.

//bar
export class Foo {

}

compiles down to:

<script>
  //bar
  export class Foo {}
</script>

The compiled version contains the export keyword when it should be removed.

[Buslowicz]

Fixed by literally adding a single letter :D (+ tests). Published as 0.4.7-rc.