First version

Usage:
gemini-coverage gen [path/to/coverage.json]

--source-root allows to specify where the source files are located.

Report will be generated in cwd within gemini-coverage directory.
Можно заюзать stylus. Выглядело бы примерно так:
```styl
.report-list {
    &__header {
        background-color: #ccc;
        padding: 3px;

        -user-select:           none;
        -moz-user-select:       none;
        -webkit-user-select:    none;
    }
    &__row {
        background-color: #bbb;
        &_odd {
            background-color: white;
        }
    }
}
```