Migration - added description to topics

[#5]
Added description in views

[#5]
Added model topic validation and decorator

[#5]
Added item_description css class

[#5]
Fixed item_description css class alignment

[#70]
Converted css syntax to sass in item_description

[#70]
reduce imgs size
badge should be centered verticaly
Merge pull request #72 from netguru/reduce-icons-size

Reduce imgs size
Updated readme file
Merge pull request #70 from netguru/add_description_to_topics

Add description to topics
remove code block
Merge pull request #77 from netguru/fix-readme

remove code block
update rails to 4.1.1
fix for breaking long string
don't exceed 80 chars per line, right Hound?
Merge pull request #80 from netguru/issue-67-data-confirmation

fix for breaking long string
Add main page screen + link to blog post
Merge pull request #81 from annban/patch-2

Add main page screen + link to blog post
bump ruby version

https://www.ruby-lang.org/en/news/2014/03/10/regression-of-hash-reject-i
n-ruby-2-1-1