Lti launch array parameters#34

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pfgray wants to merge 3 commits intomasterfrom

lti_launch_array_parameters

Commits on Sep 18, 2017

Adding extra verification method to support validating requests that may contain arrays, solves #33
pfgray
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Commits on Sep 26, 2017

Adding better typed sign & verify params signature
pfgray
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Commits on Sep 28, 2017

Adding unit tests for LtiVerifier and url parameters and updating documentation
pfgray
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