Installed jammit gem.
[source=ruby]gem install jammit[/source]
Added to gem file.
Started my server and got error no such file to load — win32/open3 (LoadError)
Then I installed the win32-open3 gem.
[source=ruby]gem install win32-open3[/source]
Again started the server got the same error and then I added it in gemfile.
Things started working properly.
I use underscore.js templating engine in my application, Now I am slowly migrating to Jammit way of templating which is very handy.