INTSAMPLES-127 Polishing

- PR Comments
- Switch to Jackson2
- Fix oxm config

Polishing

INTSAMPLES-127 Update to SI 4.0.0.RC1

INTSAMPLES-127 Remove Servlet Dependency

travel sample; see INT-3350.

INTSAMPLES-127 Update Samples to SI 4.0.0

JIRA: https://jira.spring.io/browse/INTSAMPLES-127

Created `maint` branch for ongoing SI 3.0.x samples.