fix rgba css generation, add some tests to automatically verify that themes are

build/webpack.base.conf.js

src/services/color_convert/color_convert.js

src/services/theme_data/theme_data.service.js

static/themes/redmond-xx-se.json

static/themes/redmond-xx.json

static/themes/redmond-xxi.json

test/unit/specs/services/theme_data/sanity_checks.spec.js

test/unit/specs/services/theme_data/theme_data.spec.js