Changed Application Layout to use Slim template

We used a gem called erb2slim to do the conversion.

Closes https://github.com/rapidftr/tracker/issues/130
Accidentally changed production.rb
Merge pull request #663 from rdsubhas/image_corruption

Accidentally changed production.rb
Replaced tabs with two spaces

we used this command: sed -i "" -e "s/	/  /g"
Closes https://github.com/rapidftr/tracker/issues/120
@austiine04 @ctumwebaze fix rapidftr/tracker#133 makes changelogs display field names instead of ids for newly created fields
Merge pull request #665 from ctumwebaze/master

Use human readable field names in the change log records
Merge pull request #664 from RapidRailsGirls/delete_tabs

Replaced tabs with two spaces
Further small refactorings of Child model
rapidftr/tracker#106 Log error messages when API controller catches them
Merge pull request #666 from rdsubhas/master

Log error messages when API controller catches them
Merge pull request #659 from RapidRailsGirls/erb2slim

Merged, Thanks!
Refactor and simplify Advanced Search functionality
Leftover: Date range filter in Advanced Search page
Removed custom Solr server and move to Sunspot::Solr
Added created/updated_at support, fixes all browser cukes
Updated search criteria validation, added short_id/unique_id search, all headless cukes passing
Removed unused gems and unused jasmine tests
Update cucumber rake file and remove deprecated tasks
rapidftr/tracker#41 @andreweskeclarke @mwangiann Changing sort options on Children index page to include all sortable fields
Most RSpec tests fixed except 2 Solar tests
Enable fuzzy searching - NOTE this may break some data scenarios like Verified/Unverified