Add varargs extractor tests
Make default extractor work with vararg type ascription.
Use quasiquotes in preference to manual tree building where possible.
Merge pull request #14 from jhc-systems/issue12

Extraction for case classes with varargs
Merge branch 'master' into issue13

Conflicts:
	core/src/test/scala/sqlest/extractor/ExtractorSpec.scala
Extract type parameter substitution into method. Update tests.