build process now creates propper app bundle under mac

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Updated nsis script.

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Fixed bugs to .pro file see link below for detailed dicussion.
https://bitbucket.org/dismine/valentina/pull-request/34/build-process-now-creates-propper-app/diff

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Merged in MitSchoko/valentina (pull request #34)

build process now creates propper app bundle under mac

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Fix for dialog measurements. To small width for Russian translation.

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Merge

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"Standard table" bad name for button. Better change to "Measurements".

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Better validate point label.

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Better validate point label in xsd schema.

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Validate points.

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Don't waite dialog stage, block bad data on early stage.

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Only unique points allowed.

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Window title.

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Wrong visualization if value negative.

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Fix for unary minus operation.

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Check if stack is empty like in origin muparser.

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Set angle first. Angle value can be negative.

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Undo current pattern piece.

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Do not clear undo stack after saving.

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Wrong axis if scene rect smaller than need.

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