Test different builds in each browser

[arian]

Today we test compat and nocompat, but I think we should run tests for all (sane) combinations of build possibilities (code blocks).

	compat	nocompat	ie8
ie8
compat
nocompat

possibly we can create a grunt task that builds all possibilities (together with the tests), and then configure karma to run each set after each other. Of course we can't simply include them to the karma files configuration, but maybe we can simply execute karma x times with the different builds.

@SergioCrisostomo @ibolmo

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