[WIP] [feature] StructureBracesFixer

Braces for structure blocks, fix #98

- [x] add missing braces
- [x] correct single-level intend
- [ ] correct multi-level intend
- [ ] fix #168 
- [ ] make Travis pass
what if there is no next nonw whitespace token (i.e. ``$tokenAfterParenthesis === null`` ? Is it a case which can happen in a valid PHP code base ?