[Fix #70304970] remove nil local_assigns values from blockly partial view template
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step mode for level builder, plus example levels
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Merge pull request #528 from code-dot-org/fix_70304970

[Fix #70304970] remove nil local_assigns values from blockly partial view template
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add test
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add minimal-ui viewport tag for iOS 7.1
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Merge pull request #533 from code-dot-org/minimal-ui

add minimal-ui viewport tag for iOS 7.1
level.step_mode may not be defined
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Merge pull request #532 from code-dot-org/stepMode2

step mode for level builder, plus example levels
Add Karel type and refactor.
Update tests to work with new class hierarchy.
Fix up naming of sub classes (STI) and tests.
Ajax maze builder form so we can have unified response.