Added conekta gem

Signed-off-by: Gilberto Villa <gilberto.villa@crowdint.com>
Add SubscriptionPlan model

Signed-off-by: Sergio Morales <sergio.morales@crowdint.com>
SubscriptionPlan options in the home page of authenticated users
Added default subscription plans to seeds
Added Pure CSS
Moved the markup from home/index to the layout
Styles for the layout
Refactored render_session_data
Moved CSS colors to SASS variables
Improved semantics by using certain html5 elements where possible
Using font awesome to for icon art
Merge pull request #2 from crowdint/rails_dev

Rails dev