Added `clearAllData` test function that truncates some tables

This will allow for faster reindexAll operations and should reduce some
of the load during Travis tests
Eliminate short period between creating a tenant and caching its config
Stick `before` in proper `describe` block so they don’t run before all the tests
Bump cassandra timout, reduce cassandra memory usage on Travis and not letting Redis write to disk
Increase cassandra memory, tail logs
Added an asyncCounter for the tenants module
Using asyncCounter for stop/starting a tenant
Removed tailing of cassandra logs on travis
Add content item to folder via REST api for failing folders tests

The util was purging the library, which messed up the PP generation
Giving Cassandra some time to start-up
Prepending Travis’s cassandra-env with sed

Also added some documentation in various places in the tests
Double escaping linebreaks in travis
Merge branch 'travis-reduce-reindexall' of https://github.com/oaeproject/Hilary into travis-reduce-reindexall
Tweaked test failure documentation