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WIP: Synced Adapter (#8)

* feat(newsyncedadapter): add support for synced adapter based on mongodb transactions
- Check that mongodb connection string defines replicaset
- when using setTransaction, check that replica exists
- When saving or loading policies, use session when available
- Add transaction abort and commit functions to abort/save transactioned changes

* improvement: enforce StandardJS, change useTransaction to synced, improve transaction detection

- enforce StandardJS: semicolons removed
- useTransaction changed to useSynced so that it shares the name with adapter and separates it from mongo session transactions
- Use of native `session._serverSession.isTxnActive` -function instead of looking at the error message
- Added function descriptions for all functions

BREAKING CHANGE: Function name changed to separate it from mongo session transactions

* fix(adapter.js:savepolicy): empty model should not throw an MongoError, it should return false

Previously MongoError would have been thrown since it's trying to save an empty list.

* refactor(debug): add a warning when transaction starts or aborts instead of constant debugging

* test(unit/adapter.test.js): add unit tests for missing functions and add lcov reporter to nyc

* test(integration/adapter.test.js:savepolicy): add sinon to improve empty savePolicy testing

* test(integration/adapter.test.js): add more complex model and policy to test populated v0-v4 values

Previous models only populated fields 0-2

* test(integration/adapter.test.js): failing tests for non-synced adapter transactions

* feat(adapter.js): add support for addPolicies and removePolicies in replicaset environments

* feat(.travis.yml): initial replicaset configuration

- Try rs.initiate and then loop over rs.status to check whether replicaset has been configured

* test(helpers.js): change tests to replicaset for now

* test(.travis.yml): try Bottle-Mongo's Travis-CI setup

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