Updated example files from ChEMBL namespace change
Updated document metadata
RESOLVED - issue DOC-100: Check @prefix dul 
https://openphacts2011.atlassian.net/browse/DOC-100
RESOLVED - issue DOC-125: void:...target should point to linkset
sepecific
void:dataset 
https://openphacts2011.atlassian.net/browse/DOC-125

Removed problematic statements and made explicit the interpretation to
the creation date of the linkset.
RESOLVED - issue DOC-125: void:...target should point to linkset
sepecific void:dataset 
https://openphacts2011.atlassian.net/browse/DOC-125

Added example createdWith usage into ChEMBL-RDF

Fixed uriSpaces still pointing to kasabi namespaces
RESOLVED - issue DOC-118: Specify how linksets should reference External
voids 
https://openphacts2011.atlassian.net/browse/DOC-118

Added discussion of how to declare a set of links to be in a linkset
description
RESOLVED - issue DOC-122: fix example chembl-rdf-void.ttl 
https://openphacts2011.atlassian.net/browse/DOC-122
RESOLVED - issue DOC-120: correct refernece to dataset when linkset
meant 
https://openphacts2011.atlassian.net/browse/DOC-120
RESOLVED - issue DOC-24: Add discuss about provenance vocabulary 
https://openphacts2011.atlassian.net/browse/DOC-24
Changed document metadata
RESOLVED - issue DOC-134: Validate ChEMBL-RDF VoID 
https://openphacts2011.atlassian.net/browse/DOC-134
RESOLVED - issue DOC-135: Validate ChemSpider VoID 
https://openphacts2011.atlassian.net/browse/DOC-135
Fixed location bug of dataset void file
RESOLVED DOC-123: check example chemspider2chemblrdf-linkset
https://openphacts2011.atlassian.net/browse/DOC-123
RESOLVED DOC-136: Validate example Chemspider to drugbank linkset
https://openphacts2011.atlassian.net/browse/DOC-136
RESOLVED - issue DOC-133: Validate example files against spec before
finalising release 
https://openphacts2011.atlassian.net/browse/DOC-133
Corrected dateTime format to include 'T' character
RESOLVED - issue DOC-139: fix two typos in examples 
https://openphacts2011.atlassian.net/browse/DOC-139
RESOLVED - issue DOC-141: Dataset licenses 
https://openphacts2011.atlassian.net/browse/DOC-141
RESOLVED - issue DOC-140: Link to VoID Generator 
https://openphacts2011.atlassian.net/browse/DOC-140