Switch master to 1.2.0.BUILD-SNAPSHOT
Move Spring Social and Spring Mobile configuration

This commit uses dedicated Properties classes instead of accessing
the raw environment for Spring Social and Spring Mobile. This
improves the readability and the discovery of such properties.

Fixes gh-1238
Fix typo
Use @ConfigurationProperties for Spring Batch

Fixes gh-1249
Use @ConfigurationProperties for Thymeleaf

Fixes gh-1250
Use @ConfigurationProperties for Thymeleaf

Add missing properties to complement 6568495

Fixes gh-1250
Missing setter on spring.batch.job.names property

Relates to gh-1249
Dependencies for json-path in test starter