spell check not working in 0.67, Linux

[Jason]

I installed Zim 0.67-1 from Manjaro's repository, and from the repository again installed `gtkspell`, `python2-gtkspellcheck` and `aspell-en`. Then after activating spell check plugin, it doesn't do anything when I type in some crazy things.

After downgraded to 0.65, without any other changes, spell checking works.

Below is the output of `zim -D`:

```
WARNING: Can not import 'xdg.Mime' - falling back to 'mimetypes'
WARNING: Can not import 'xdg.Mime' - falling back to 'mimetypes'
INFO: This is zim 0.67
DEBUG: Python version is sys.version_info(major=2, minor=7, micro=13, releaselevel='final', serial=0)
DEBUG: Platform is posix
DEBUG: No bzr version-info found
DEBUG: Not running from a source dir
DEBUG: Set XDG_DATA_HOME to /home/guangzhi/.local/share
DEBUG: Set XDG_DATA_DIRS to [<Dir: /usr/share>, <Dir: /usr/local/share>]
DEBUG: Set XDG_CONFIG_HOME to /home/guangzhi/.config
DEBUG: Set XDG_CONFIG_DIRS to [<Dir: /etc/xdg>]
DEBUG: Set XDG_CACHE_HOME to /home/guangzhi/.cache
DEBUG: Connecting to /tmp/zim-guangzhi/primary-0.67-e63203e4
DEBUG: Dispatched command (u'-D',)
```