Implement NXQL BETWEEN for MongoDB

Caused by: java.lang.UnsupportedOperationException: BETWEEN
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBQueryBuilder.walkExpression(MongoDBQueryBuilder.java:144)
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBQueryBuilder.walkOperand(MongoDBQueryBuilder.java:474)
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBQueryBuilder.walkOperandList(MongoDBQueryBuilder.java:529)
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBQueryBuilder.walkAnd(MongoDBQueryBuilder.java:361)
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBQueryBuilder.walkMultiExpression(MongoDBQueryBuilder.java:353)
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBQueryBuilder.walkExpression(MongoDBQueryBuilder.java:119)
	at org.nuxeo.ecm.core.storage.mongodb.MongoDBRepository.queryAndFetch(MongoDBRepository.java:602)
	at org.nuxeo.ecm.core.storage.dbs.DBSSession.doQueryAndFetch(DBSSession.java:1555)
	at org.nuxeo.ecm.core.storage.dbs.DBSSession.doQuery(DBSSession.java:1482)
	at org.nuxeo.ecm.core.storage.dbs.DBSSession.query(DBSSession.java:1455)
	at sun.reflect.GeneratedMethodAccessor57.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.nuxeo.ecm.core.storage.dbs.DBSRepositoryBase$DBSSessionInvoker.invoke(DBSRepositoryBase.java:297)
	at com.sun.proxy.$Proxy45.query(Unknown Source)
	at org.nuxeo.ecm.core.api.AbstractSession.query(AbstractSession.java:1329)