Error in directive localize unbind hook: "ReferenceError: vm is not defined"

[Cameron Gaut]

1. Describe your issue:
   This bug appears in the "unbind" function, when a component containing localized text is hidden with v-if

2. Can you reproduce the issue?
   Yes

3. On which browser/OS does the issue appear?
   All platforms

4. Which version of v-localize does it affect?
   1.2.1

5. How would you tag this issue?
   Bug

See: https://jsfiddle.net/seegodesign/yh3mtsa0/4/

[John W. Nolette]

Resolved in #38.

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