Log Message:
Update ruby-gettext to 3.2.0.

## 3.2.0: 2015-12-31 {#version-3-2-0}

### Improvements

  * Improved fuzzy detection for sub text.

## 3.1.9: 2015-12-30 {#version-3-1-9}

### Improvements

  * Improved fuzzy detection for small texts.
    [GitHub#43][Reported by Mamoru TASAKA]

### Thanks

  * Mamoru TASAKA

## 3.1.8: 2015-12-29 {#version-3-1-8}

### Improvements

  * Improved fuzzy detection.