This implementation allows the plugins to be defined as an object instead of an array. The benefit
is readability and usability, especially when using yaml format, where empty objects can be left
out. In Javascript, the benefit is more limited since it is necessary to put in the empty objects,
but even then the configuration should be more intuitive. This is implemented in backwards
compatible way, where the original format is still used internally, so nothing should break.

…ugin object format

…S locale

Added tests to check different situations that the normalization function could in the worst case
encounter. Also added LANG=en_US.UTF-8 in front of the test scripts to guarantee that the tests are
run using English language locally. Without the variable, yargs will use whatever is set to LANG and
some tests will fail.