Dropping call_user_func_array from Safe functions

[moufmouf]

call_user_func_array can legitimately return false.

• there is no sane way to handle protected methods.

Closes #73

Warning, this PR introduces breaking changes.

[coveralls]

Pull Request Test Coverage Report for Build 144

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 34.417%

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Totals
Change from base Build 142:	0.0%
Covered Lines:	180
Relevant Lines:	523

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💛 - Coveralls