Issue title: Build fails on 32-bit systems
 Issue body: Build of version 2.9 fails on FreeBSD 10 i386:

```
src/ytregions.cpp:92:9: error: return type 'YTRegion' must match previous return type 'const YTRegion' when lambda expression has unspecified explicit return type
        return YTRegion();
        ^

```
 Comments: 
 Comment 0: Thanks this is fixed now
{'source': 'GithubIssues', 'repo_name_with_owner': 'flaviotordini/minitube', 'issue_id': 297678593, 'repo_stars': 341.0}