upped py2neo requirement to 1.6.2
initial syntax fixes
fixed OPTIONAL MATCH issue
removed rogue punctuation
more tweakery
updated supported server versions
updated CHANGES file
Merge branch 'master' into neo2cypher

Conflicts:
	.travis.yml
	CHANGES
	kaiso/persistence.py
	requirements.txt
Merge branch 'master' into neo2cypher

Conflicts:
	CHANGES
Merge remote-tracking branch 'origin/master' into neo2cypher

bump version with -dev

Conflicts:
	CHANGES
Merge branch 'master' into neo2cypher

Conflicts:
	CHANGES
	setup.py
ready for release