File extensions with multiple dots are not preserved when using minimatch

[CaryLandholt]

Take the following file foo.bar.coffee.

The file is compiled to JavaScript successfully; however, the compiled file is named foo.js instead of foo.bar.js.

coffee: {
  scripts: {
    cwd: './src/',
    src: '**/*.coffee',
    dest: './dest/',
    expand: true,
    ext: '.js'
  }
}

[shama]

Please see this issue: gruntjs/grunt#750 and this SO: http://stackoverflow.com/questions/16697344/configure-grunt-file-name-matching-for-files-with-multiple-dots

Currently you need to use the rename option.