Add thumbnailer gem, update README.

Gemfile

@@ -64,12 +64,15 @@ gem 'delayed_job_active_record'
 # required by cap3 delayed-job but has to be specified manually >_<
 gem 'daemons'
 
+# dataset previews
+gem 'thumbnailer', :git => 'https://github.com/merlin-p/thumbnailer.git'
+
 group :production do
   if ENV["RAILS_ENV"] == "production"
     gem 'openbabel'
   end
   gem 'unicorn'
-  
+
 end
 
 group :development, :test do

Gemfile.lock

@@ -10,6 +10,12 @@ GIT
   specs:
     openbabel (2.3.2.1)
 
+GIT
+  remote: https://github.com/merlin-p/thumbnailer.git
+  revision: 33933ff636bbc0f3b0ab53735749b71ab8955b77
+  specs:
+    thumbnailer (0.1.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -402,6 +408,10 @@ DEPENDENCIES
   sdoc (~> 0.4.0)
   spring
   thin
+  thumbnailer!
   uglifier (>= 1.3.0)
   unicorn
   web-console (~> 2.0)
+
+BUNDLED WITH
+   1.10.6

README.md

@@ -17,6 +17,10 @@ if there are errors with nokogiri compilation with new xcode7:
 * `apt-get install libmagickcore-dev libmagickwand-dev` for linux
 * if installing the rmagick gem fails you may try: `IM_PREFIX=$(brew list imagemagick 2>&1 | grep -E 'identify$' | sed 's/bin\/identify$//g') PKG_CONFIG_PATH=${IM_PREFIX}lib/pkgconfig/ C_INCLUDE_PATH=${IM_PREFIX}include/ImageMagick*/ gem install rmagick` (OSX only)
 
+## Dataset previews
+* `brew install imagemagick mplayer` for OSX
+* `sudo apt-get -y install imagemagick mplayer` for Linux
+
 ## Application Setup
 * Execute `bundle install`.
 * Execute `rake db:reset` (this creates and seeds the database).
@@ -47,26 +51,6 @@ Currently 3 users are seeded with respective email `test@ninjaconcept.com`, `hat
 
 Run `rake jobs:work` for asynchronous handling of email notifications. Run `mailcatcher` in your console and go to `localhost:1080` to see all sent mails.
 
-# API (v1)
-
-## Collections
-
-* Get serialized, unshared collection roots for current user
-
-  `/api/v1/collections/roots`
-
-* Get serialized, shared collection roots for current user
-
-  `/api/v1/collections/shared_roots`
-
-* Get serialized samples by collection id
-
-  `/api/v1/collections/:collection_id/samples`
-
-* Get serialized sample by id
-
-  `/api/v1/samples/:id`
-
 # Icon Font
 
 * put new icons as SVG files (e.g. '<ICON_NAME>.svg') in `app/assets/images/svg_icons`

config/initializers/thumbnailer.rb

+Thumbnailer.config do |c|
+  c.thumbnail_size = 128
+  c.cache_path = "#{Rails.root}/tmp/cache/assets/development/thumbnails/"
+  c.render_dpi = 90 # PDF render resolution
+  c.video_skip_to = 1 # first second
+end