test case for event refs with context
reverse mapping on computation
allow empty string partials
support empty string return as no-op for most plugins"
basic transfer of mapping and depencies between viewmodels
prevent ownership transfer of computation. refactoring
merge
avoid partial expression inception invovling recursive data structures
Merge pull request #1501 from evs-chris/dev

Avoid partial expression inception invovling recursive data structures
working on reversing reversed mapping
merge changes
Merge pull request #1488 from ractivejs/empty-things

Support for no-op plugins when empty strings
let mapping transfer existing dependents
allow inflight event unsubscribe, fixes #1504
implement .once and .observeOnce, closes #1423
Merge pull request #1505 from ractivejs/gh-1504

Add .once and .observeOnce, fix inflight unsubsribe
named partials shouldn't try to rebind themselves
Merge pull request #1508 from evs-chris/gh-1507

Named partials shouldn't try to rebind themselves...
replace asterisks in computation keypaths to avoid blowing up pattern observers
queue event stack for nested method calls and events