Fixing Mongo id generation regression in a v0.35.1 release

[fcamblor]

PR aiming at rolling back jongo / mongo-java-driver / bson4jackson upgrade occured on 0.35 and which implied a critical regression (see #285) with no workaround at that time.

I'd like to make a 0.35.1 release with this rollback.

Upgrade to jongo 1.3.0 (or maybe 1.4.0) will occur someday, but we need to sort out how jongo will handle bson4jackson 2.7 dependency first as currently, jongo 1.3.0 & bson4jackson 2.8.0 are incompatible)

Dependencies rollback compared to 0.35 will be :

• jongo : 1.3.0 -> 1.1 (I kept 1.0 -> 1.1 upgrade because no regression has been identified on jongo 1.1)
• mongo-java-driver : 3.4.0 -> 2.11.3 (jongo 1.1 is not compatible with mongo java driver 3.x)
• bson4jackson : 2.8.0 -> 2.3.1 (bson4jackson 2.8 & 2.7 are not compatible with jongo 1.1)