Uses more web-friendly and robust slugs for album filenames (no quotes, no colons…)

Fixes #164

src/model/album.js

@@ -14,6 +14,7 @@ var index = 0
 
 // number of images to show in the album preview grid
 const PREVIEW_COUNT = 10
+const SLUGIFY_OPTIONS = { replacement: '-', remove: /[*+~.()'"!:@]/g }
 
 const SORT_ALBUMS_BY = {
   'title': function (album) { return album.title },
@@ -36,7 +37,7 @@ function Album (opts) {
   if (typeof opts === 'string') opts = { title: opts }
   this.id = opts.id || ++index
   this.title = opts.title || ('Album ' + this.id)
-  this.basename = slugify(this.title)
+  this.basename = slugify(this.title, SLUGIFY_OPTIONS)
   this.files = opts.files || []
   this.albums = opts.albums || []
   this.depth = 0

test/model/album.spec.js

@@ -24,6 +24,17 @@ describe('Album', function () {
       should(a.basename).eql('and-deja-vu')
     })
 
+    it('sanitises more special characters than the slugify() default', function () {
+      const a = new Album(`hello*+~.()'"!:@world`)
+      should(a.basename).eql('helloworld')
+    })
+
+    it('doesn\'t use a dash if the words have no space', function () {
+      // not ideal but that's hoz slugify() works
+      const a = new Album("aujourd'hui")
+      should(a.basename).eql('aujourdhui')
+    })
+
     it('concatenates nested filenames for uniqueness', function () {
       // to avoid having two nested albums called "October" overwrite each other
       // note: doesn't use the root title to avoid "home-" or "index-"