Parse arithmetic#14

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forivall wants to merge 20 commits intogrncdr:masterfrom

forivall:parse-arithmetic

Commits on Mar 15, 2016

wip: adding arithmetic statement support
forivall
committed

Commits on Mar 16, 2016

Parse arithmetics
forivall
committed

Commits on Mar 25, 2016

Properly parse numbers
forivall
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Commits on Mar 26, 2016

Commits on Apr 6, 2016

Implement recursive postfix parsing
forivall
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Commits on Apr 8, 2016

Commits on Apr 10, 2016