Merge remote-tracking branch 'pr/237' into develop

Twitter Feature on Main-View from @loadtocode

Twitter feature within home/index of LEAP web app as feed of tweets of one user's twitter account

How to use it: set up an Application-only authentication by twitter (https://dev.twitter.com/oauth/application-only) and then create a config/secrets.yml including:
```
development:
  twitter:
    enabled: false # set to true for usage
    twitter_handle: XXXXX #put your twitter handle here
    bearer_token: XXXXX #put your bearer token here
test:
  twitter:
    enabled: false # set to true for usage
    twitter_handle: XXXXX #put your twitter handle here
    bearer_token: XXXXX #put your bearer token here
```

things in the PR:

- [x] gemfile:twitter
- [x] twitter helper (caching (to avoid reaching twitter rate limits)
- [x] index twitter view
- [x] twitter css (twitter design as discussed in call: Profil-Header: Picture, Link to twitter + twitter_handle; removed picture and twitter_handle from individual tweet, heading aligns at the top, only the last 3 tweets are shown)
- [x] script to generate bearer token
- [x] script to invalidate generated bearer token
- [x] documentation (Readme + Doc)

1 files changed, 19 insertions, 12 deletions

diff --git a/app/views/home/_content.html.haml b/app/views/home/_content.html.haml
index 67e4533..5341189 100644
--- a/app/views/home/_content.html.haml
+++ b/app/views/home/_content.html.haml
@@ -1,12 +1,19 @@
-.row
-  %h1= t(:welcome, :provider => APP_CONFIG[:domain])
-  .p=t(:welcome_message_html)
-
-.row
-  = home_page_buttons
-
-  - if Rails.env == 'development'
-    .row
-      %hr
-      %p
-        = link_to "make donation", new_payment_path if APP_CONFIG[:payment].present?
+.col-md-8
+  .row
+    %h1= t(:welcome, :provider => APP_CONFIG[:domain])
+    .p=t(:welcome_message_html)
+
+  .row
+    = home_page_buttons
+
+.col-md-1
+
+.col-md-3
+  .row
+    = render 'twitter/index'
+
+    - if Rails.env == 'development'
+      .row
+        %hr
+        %p
+          = link_to "make donation", new_payment_path if APP_CONFIG[:payment].present?