[WIP]Fix wasm-bindgen #93

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osuketh wants to merge 8 commits intomasterfrom

feature/fix-wasm-bindgen

Commits on Apr 2, 2019

Reading the Parameter is wrong
osuketh
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Commits on Apr 3, 2019

Add test for get_call()
osuketh
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Commits on May 23, 2019

Commits on May 25, 2019

Make &str type to proving_key
osuketh
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Commits on May 27, 2019

Change proving_key type
osuketh
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