adjusting caching rules

When trying to get up and running the repvious caching rules caused errors:
Invalid value for property 'caching'. It should be a string

After trying various alternatives al messages seemsed to suggest that the only valid
types were ALL, KEYS_ONLY, ROWS_ONLY, NONE. Given what was there it looked like NONE
was the desired option.
Added dispatcher.dispatch_interval config item

Also added the datastore call InsertLink as an alias for inserting only
one link into InsertLinks.
Merge branch 'master' into dispatch-interval

Conflicts:
	walker.yaml
Merge pull request #99 from iParadigms/dispatch-interval

Dispatch interval
Merge pull request #96 from nathj07/schema_fix

adjusting caching rules
Merge branch 'master' into AutoReclaimDomains

Conflicts:
	cassandra/dispatcher.go
	cassandra/dispatcher_test.go