Fix morphTo

Merge pull request mongodb#620 from neoxia/master

Fix mongodb#607 exists() bug and assure compatibility with Laravel 5.1.19

Merge pull request mongodb#599 from jenssegers/analysis-XZragX

Applied fixes from StyleCI

Fix issue mongodb#596

Add back freshTimestamp

Bump Laravel version in composer as well

Merge pull request mongodb#580 from tacone/patch-1

Stub Schema::hasColumn(), fixes mongodb#579

Merge mongodb#383

Primary index is alias for unique index

Merge pull request mongodb#460 from NSmithUK/AddMongoClientDriverOptions

Added support for passing driver options to MongoClient (SSL support)