Added tests for renderColorImage (#230)
Added tests for renderColorImage (#230)

* added basic initial tests for renderColorImage

* changed test asserts for renderColorImage

* Update renderColorImage_test.js

added clarifying comments, extended tests

cornerstonejs/cornerstone,cornerstonejs/cornerstone,chafey/cornerstone,cornerstonejs/cornerstone,chafey/cornerstone,cornerstonejs/cornerstone