added ElementMapperGraph to allow passing a graph object to mapper tasks
fix streaming properties being indexed
allow configuration of indices to query (closes issue #21)
remove unused code
create and initialize indexes on startup
ensure property type is created on already existing index
[maven-release-plugin] prepare release 0.8.0
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' into es-only

Conflicts:
	securegraph-elasticsearch-base/src/main/java/org/securegraph/elasticsearch/ElasticSearchSearchIndexBase.java