New diagram including livestock use case

update URI to SAREF for: FeatureOfInterest, isPropertyOf, hasProperty,
hasFeatureOfInterest, isFeatureOfInterestOf and measurementMadeBy

Extended foaf:Agent by s4city:Agent. Replaces occurrences of
foaf:Agent. Updated diagram and HTML

added diagram and owl code for s4agri first working draft

added saref:hasDescription only rdfs:Literal as local restriction

update HTML for revision version and overall diagram

Removed s4city:Measurement.
Removed skos:Concept generalising the solution to broader options.

Updated diagram according to @rgcmme updates

added diagram for examples and SAREF4CITY validation workshop slides

Added axiom for local restrictions for the S4CITY ontology

reuse of geosp classes and properties
updated diagram

Modifications about KPI properties and reuse of geoSPARQL at
conceptualisation level

Added KPI value for decoupling KPI definition and value
Added time:Instant
Andre relation between KPI value and measurements
Added foam:Agent hierarchy
Added takesPlaceAtFacility
Deleted Rule
Deleted aggregatesData
Deleted NonConvexInterval

Diagram with datatype properties
Proposal for KPI decoupling

new diagram with properties.
added skos:Concept

added rdfs labels and comments

Setup for folder and empty ontology for s4city