Added 'matches' constraint
Constraint to define a regular expression and force data integrity.
Add test module to help in testing lightblue plugins.
Merge pull request #109 from skavanagh/add-matches-constraint

Add matches constraint
Merge pull request #213 from dcrissman/metadata-test-utils

Add test module to help in testing lightblue plugins.
Merge remote branch 'upstream/master' into feature-association

Conflicts:
	metadata/src/main/java/com/redhat/lightblue/metadata/parser/DefaultFieldConstraintParsers.java
	metadata/src/main/resources/json-schema/metadata/schema.json