Fixed speed performance issue on index pages

The reason is wrong using of combination of
.includes and .references.
With .references option - same SQL loads x10 slower
Implemented dummy rake script

It populates all necessary content including:
organisations, needs, plans, content items e.t.c
Added unique validations for Orgs & Needs

api_id field should be unique for Organisation and Need
added validations, corrected Rspec tests
Merge pull request #89 from bitzesty/add-unique-validations-to-orgs-and-needs

Added unique validations for Orgs & Needs
Merge pull request #90 from bitzesty/dummy-script-implementation

Implemented dummy rake script
Merge pull request #91 from bitzesty/speed-performance-tweaks-on-index-pages

Fixed speed performance issue on index pages
Revert "drop the per page count of content plans"

This reverts commit e16d8b6d9ae8b250af8220811062e9ee894e8764.
Revert "Also drop the content per page count"

This reverts commit 75ff9e78d05f0ea23f223ee61aca4b93375baba2.