Merge branch 'master' of https://github.com/hleumas/clean_sync into concurrency-issues
Merge branch 'master' into concurrency-issues
Merge branch 'cleaning-up' into concurrency-issues
Local paths to directories are needed during development.
Refactoring mongo_provider.
diffFromVersion concurrency issues resolved (using query "before or after").
Merge branch 'cleaning-up' into concurrency-issues

Conflicts:
	bin/example_server.dart
	pubspec.yaml
MongoProvider refactoring.
Fixed bug: selector overriding its key-val pairs.
Obtaining data and version using version->data->version approach.
Version number is allways unique (optimistic loop).
Renaming libraries.
Bugfix in MongoProvider diffFromVersion
Merge branch 'master' into concurrency-issues

Conflicts:
	bin/example_server.dart
Adjusting to new sytax in clean_data: fromMap -> from.
MongoDatabase can create indexes.
Merge pull request #4 from cleandart/concurrency-issues

Concurrency issues