Fix nil value error.

The 'cyclefocus' variable was referred to at definition time. This
caused the variable to be always nil. Defining the variable before
assigning fixes this.

Fixes #3
Merge remote-tracking branch 'siebz0r/issue_3'
Use `local` with require, now that it works ;)

Ref: https://github.com/blueyed/awesome-cyclefocus/issues/3