Change proguard minification

[Axel Kramer]

Change proguard minification.

the minified version of the Symja library should keep all public

org.matheclipse.**

packages and subpackages from being obfuscated.

All classes which mplement the following interfaces should be kept from being obfuscated:

java.lang.Number
org.apache.commons.math3.Field
org.apache.commons.math3.FieldElement

[Axel Kramer]

See commits: 8a52b1f 3ad7f3b

[Axel Kramer]

I uploaded symja-lib-2015-04-06.jar.

Could someone please test this new version which should replace the symja-mini versions in the future?

[Axel Kramer]

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