specs: lop "_with_dates" off of expected SQL
Node/Nodifier: add Node#tree, revert Node#initialize
StreamForOccurrenceDouble#evaluate: add this
spec: assortment of fixes to get specs working again
Occurrence: retool #query to work with tests
TimeWindow: use Sequel's date_arithmetic for date manipulation
Make changes to support Oracle
TimeWindow: fixes to Oracle changes
Node: hack to support Oracle's TO_DATE when casting person's DOB
GraphNodifier: updates to use Node#tree attr_accessor
Intersect: Oracle doesn't support INTERSECT ALL?
Node: oracle can't COALESCE heterogeneous numbers and strings
DateRange: postgres can't determine type on string literals
spec: fix up a few specs regard text/date casting
Version: bump to 0.0.7
Merge branch 'feature/oraclize' into develop
Merge branch 'release/0.0.7'

Conflicts:
	CHANGELOG.md
	lib/conceptql/version.rb