Fixed chaining bug in EMongoCriteria when adding $or conditions
Merge branch 'master' of https://github.com/Sammaye/MongoYii.git
Some documentation adjustments and corrections
Added fix for primaryKey usage in update to force it to work only on _id
for certain parts that require the usage of _id.
Merge branch 'master' of https://github.com/Sammaye/MongoYii.git
Revert part of last commit
Merge remote-tracking branch 'upstream/master'

Conflicts:
	EMongoDocument.php