Adds functionality so that WMS layers reflect the difference between default and selected opacity
Adds Jasmine and PHPUnit tests for WMS layer selected opacity feature
Combines the separate vector/WMS highlight/select methods into combined (un)highlight/(un)select methods.
Shuffling around the WMS opacity tests for structural consistency.
Gets rid of the obsolete WMS selection tests.
Adds a basic vector layer selection test, which strangely wasn't already there.
Moves the WMS unselect test into the main unselect subscription suite.
Finishes reorganizing the WMS subscription tests.