Revert "getQueryParameter should be getQueryObject"

This reverts commit 0afa2c453b6f2e38614379de9e40cadd625ec15f.

As pointed out by Ken, getQueryParameter is the form taken
by the remainder of the WebGL API.
Merge pull request #586 from grorg/revert-query-parameter

Revert "getQueryParameter should be getQueryObject"