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Fix fighter abilities and do not rely on effects' removed attributes …

…anymore

fix travis file

Merge pull request pyfa-org#1853 from blitzmann/CIUpdates

CI updates

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Merge pull request pyfa-org#1799 from pyfa-org/mutation_gauge_fix

Mutation gauge fix

Merge pull request pyfa-org#1776 from pyfa-org/release/v2.5.1

release 2.5.1