Define types for all properties in css-transitions.
Merge pull request #43 from dstockwell/more-property-types

Define types for all properties in css-transitions
Support integer type
Remove redundant assignment
Support rect() type
Merge pull request #44 from dstockwell/integer-type

Support integer type
Merge pull request #46 from dstockwell/rect-type

Support rect() type
Fix line length in test-parent.html
Remove ClonedAnimation
Remove unused house-script.js
TimedItem.parentGroup should be an AnimationGroup, not a TimedItem

TimedItem attempts to use the following methods and properties of its
parentGroup member.
- iterationTime
- paused
- _childrenStateModified()
- type
- remove()
- indexOf()
- _addChild()

Of these, only the first two are provided by TimedItem. The others are added
only by AnimationGroup.
Make use of TimedItem._effectiveParentTime
Make use of ParGroup for DEFAULT_GROUP
Merge pull request #48 from steveblock/timeSourcesCleanup

Time sources cleanup
Fix demo_example.html

Also replace tabs with spaces and add links as shortcuts to the test functions.
Remove declarative bindings

These were only an experimental work-in-progress, and are likely to change
significantly as a result of the proposed API changes regarding TimeSources.
Removing them now to simplify the process of making those API changes.
Remove templates

These have been dropped from v1 of the spec.
Merge pull request #49 from steveblock/timeSourcesCleanup

More time sources cleanup
let length interpolation be independent of the expected length types
let length addition be independent of the expected length types