producing bsons and lists from various argument types goes to reusable utulities functions
fixes mongosoup/rmongodb#64
merging

Merge branch 'master' of https://github.com/mongosoup/rmongodb

Conflicts:
	R/bson_convert.R
small style changes
replacement of mongo.cursor.to.list
new 1.8.0 rmongodb version
Merge pull request #65 from dselivanov/master

1.8.0 version