Rename isFixedWidth, isFixedHeight to _isFixedWidth, etc. Close #447
protectify availableWidth, availableHeight
Revert "protectify availableWidth, availableHeight".

Realized it will be easier to just strip all member variables from the .d.ts

This reverts commit 05a6019c7deb8d5a7f476dac5248078b68022ec8.
Update built files
Have grunt:sed strip out public member variables from the d.ts file, hiding
them from the API. Close #415, #389.
Merge pull request #459 from palantir/simplify-api

Simplify api