Eliminate Meteor.Collection2 and instead extend Meteor.Collection directly
Add support for the `index` option
Add a note about unique+index in the README.md
Rely on MongoDB to check uniqueness on the server
Make the `index` option compatible with the `optional` one
Test MongoDB reject if we violate the unique constraint of an index
Update `sparse` condition
Merge pull request #39 from mquandalle/server_index

Add support for the `index` option
more logical logic
Merge origin/unwrap into unwrap

Conflicts:
	collection2.js
more logical logic
Clarify condition
Merge pull request #43 from mquandalle/clarify

Clarify condition
revert to allowing schema definitions instead of only SS instance
update test to make sure schema definitions are supported as `schema` option value
map Meteor.Collection2 to Meteor.Collection for backwards compatibility
fixes so that schemaless Meteor.Collections still work
update docs
version bump
note that offline-data support is gone