envelope method on Terraformer.Primitive, the get() methods on collections return Primitives
AMD modules should also declare browser globals
Add get(index) method to primitives
Rebuild and conform all tests passing
add tests for envelopes
update timezone demo to use Feature.envelope and Feature.contains methods
more doc on primities
wrap up more circle docs
merge
Merge pull request #64 from patrickarlt/master

Add lots of convenience methods to primitives for various things.