add LTS 2.4 and 2.8 support

.travis.yml

@@ -7,11 +7,15 @@ sudo: false
 
 cache:
   directories:
-    - node_modules
+    - $HOME/.npm
+    - $HOME/.cache # includes bower's cache
 
 env:
+  # we recommend testing LTS's and latest stable release (bonus points to beta/canary)
   - EMBER_TRY_SCENARIO=default
   - EMBER_TRY_SCENARIO=ember-1.13
+  - EMBER_TRY_SCENARIO=ember-lts-2.4
+  - EMBER_TRY_SCENARIO=ember-lts-2.8
   - EMBER_TRY_SCENARIO=ember-release
   - EMBER_TRY_SCENARIO=ember-beta
   - EMBER_TRY_SCENARIO=ember-canary
@@ -22,13 +26,15 @@ matrix:
 before_install:
   - npm config set spin false
   - npm install -g bower
+  - bower --version
   - npm install phantomjs-prebuilt
+  - node_modules/phantomjs-prebuilt/bin/phantomjs --version
 
 install:
   - npm install
   - bower install
 
 script:
   # Usually, it's ok to finish the test scenario without reverting
-  #  to the addon's original dependency state, skipping "cleanup".
-  - ember try $EMBER_TRY_SCENARIO test --skip-cleanup
+  # to the addon's original dependency state, skipping "cleanup".
+  - ember try:one $EMBER_TRY_SCENARIO test --skip-cleanup

config/ember-try.js

@@ -18,6 +18,28 @@ module.exports = {
         }
       }
     },
+    {
+      name: 'ember-lts-2.4',
+      bower: {
+        dependencies: {
+          'ember': 'components/ember#lts-2-4'
+        },
+        resolutions: {
+          'ember': 'lts-2-4'
+        }
+      }
+    },
+    {
+      name: 'ember-lts-2.8',
+      bower: {
+        dependencies: {
+          'ember': 'components/ember#lts-2-8'
+        },
+        resolutions: {
+          'ember': 'lts-2-8'
+        }
+      }
+    },
     {
       name: 'ember-release',
       bower: {