Add a couple new UI elements, change UI so items are displayed in order they are added#13

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mkokotovich wants to merge 7 commits intomarcoschwartz:masterfrom

mkokotovich:master

Commits on Mar 19, 2016

Add basic button to call a custom function
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Make the function_button automatically add the function to the aREST parent
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Commits on Mar 21, 2016

Add a Function With Input Button to be able to pass parameters to a function
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Add a variable label that automatically registers the variable with the parent class
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Add items to UI in order they were added
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Commits on Apr 8, 2016

Add a bool to add_label that makes the label text smaller
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Commits on Apr 9, 2016

Made margins smaller on smalltext label
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