update for elephantdb 0.4.0
bump to 0.4.0-RC1
fix tests
Merge branch 'develop' into feature/edb_0.4.0

Conflicts:
	cascalog-elephantdb/project.clj
remove cascalog-core from deps
Merge branch 'develop' into feature/edb_0.4.0

Conflicts:
	cascalog-elephantdb/project.clj
Merge pull request #122 from nathanmarz/feature/edb_0.4.0

make cascalog-elephantdb compatible with elephantdb 0.4.0-RC1