Upgrade to Rails 5.0

[shlok007]

Refer to issue #1087

2596c50 This commit updates the Gemfile with compatible version of gems for Rails 5.0

• Removed quiet-assests gem as it is now built inside sprocket-rails.
  Reference: Silence asset requests with config.assets.quiet  rails/sprockets-rails#355
• Removed activeuuid as rails 5 has built in support for uuid primary keys.
• rails_observers supported version for rails 5 has not yet been released. However, Updated gem to work (and successfully test) with Rails 5.0 rails/rails-observers#39 makes it compatible with rails 5, so using a forked repository helps.
• awesome_nested_set updated to version 3.1

519a361 Committed after running rails app:update . The overwritten configurations had to be added manually so, kindly review this.
Approach taken from: http://pages.citebite.com/q5b3s6r9u4nyk

cdd2242 Generated new schema.
Reference: https://hashrocket.com/blog/posts/how-to-upgrade-to-rails-5#4-generate-the-db-schema-rb-file-again

Note: This is an ongoing PR and contains incomplete changes.

[hennevogel]

If it's ongoing please open the PR once you're ready for us to pull :-)

[hennevogel]

Especially after your PR to rails_observers is merged because this won't go into OSEM before...

[ChrisBr]

So let's close this one till it is ready to merge?

Anyway, @shlok007 thanks for your contribution and I will look forward when it's ready to merge! Highly appreciated 👍

[siaw23-retired]

any update on this? @ChrisBr @hennevogel @shlok007