Compress cache manifest files (.appcache/manifest)

* Cache manifest files are basically text files, therefore,
  they compress quite nicely.

* Browsers that have support for the application cache mechanism
  don't seem to encounter any problems when the cache manifest
  files are being served compressed.

See also: http://www.whatwg.org/specs/web-apps/current-work/multipage/offline.html

Author: alrra

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### HEAD
 
+* Compress cache manifest files (`.appcache` / `.manifest`).
 * Move all compression related configs under the `Compression` section
   [[73a107e](https://github.com/h5bp/server-configs-apache/commit/73a107ed0cb9ae4b3ec966e8e246b7a6f4bbd059)].
 

src/.htaccess

@@ -595,6 +595,7 @@ AddDefaultCharset utf-8
                                       font/opentype \
                                       image/svg+xml \
                                       image/x-icon \
+                                      text/cache-manifest \
                                       text/css \
                                       text/html \
                                       text/plain \

test/fixtures/content/.htaccess

@@ -329,6 +329,7 @@ AddDefaultCharset utf-8
                                       font/opentype \
                                       image/svg+xml \
                                       image/x-icon \
+                                      text/cache-manifest \
                                       text/css \
                                       text/html \
                                       text/plain \

test/test.js

@@ -61,7 +61,6 @@ var tests = [
             'test.appcache': {
                 headers: generateHeaders({
                     'cache-control': 'max-age=0, no-transform',
-                    'content-encoding': undefined,
                     'content-type': 'text/cache-manifest'
                 })
             },
@@ -245,7 +244,6 @@ var tests = [
             'test.manifest': {
                 headers: generateHeaders({
                     'cache-control': 'max-age=0, no-transform',
-                    'content-encoding': undefined,
                     'content-type': 'text/cache-manifest'
                 })
             },