Merge pull request #34 from olberger/master

Support multi-valued relations in setRel
Fix security issues.
Add Composer config.
Add basic README.
Added full path to 'require'
Merge pull request #38 from jonphipps/PathUpdate

Added full path to 'require' in tests
Set MySQL's session option "SQL_BIG_SELECTS=1", so that complex JOINs work with default/low "max_join_size" value.
Merge branch 'master' of github.com:semsol/arc2.git
Increase chunk size fed into Turtle triple extractor to avoid timeouts caused by huge property lists (bigger chunk size means less loops until the final triple object is found).
Add a specialized setProp for xsd:dateTime literals