Added: Age handle in Cached Statements

Added: PreparedStatementCache tests
Added: Session as PreparedStatementCache construct requirement

Without session the cache doesn't work, therefore make it mandatory
Changed: Minor convenience change to Math.max
Added: BatchedActions processor, handling an array of Persistor Actions
Added: Documentation about batched operations
Changed: Separated Surefire and Failsafe tests (unit/integration)
Merge remote-tracking branch 'origin/master' into 0.4.0

Conflicts:
	README.md
	pom.xml
Added: Broken Batched Actions Test

Changed: Added integration tests to Travis CI
Removed: Broken travis.yaml
Changed: mod.json multi-threaded to false #7

Added: Multi processes firing queries test
Merge branch 'master' of https://github.com/nea/vertx-mod-cassandra-persistor

Conflicts:
	src/main/java/com/insanitydesign/vertx/CassandraPersistor.java
	src/main/java/com/insanitydesign/vertx/PreparedStatementCache.java