overhaul python error reporting for structured failure#7

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CesiumLifeJacket wants to merge 24 commits intorjbs:mainfrom CesiumLifeJacket:master

+422-170

Commits on Jul 31, 2015

Commits on Aug 3, 2015

minor stylistic improvements
Vonderfecht
committed
bug fixes to the range validator
Vonderfecht
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Commits on Aug 6, 2015

added SchemaTypeMismatch and SchemaValueMismatch exceptions
Vonderfecht
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added SchemaRangeMismatch
Vonderfecht
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substituted format method for % operator
Vonderfecht
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removed superfluous .keys() calls
Vonderfecht
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Made compatible with Python 2
Vonderfecht
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tests no longer print out the SchemaMismatch error
Vonderfecht
committed

Commits on Aug 7, 2015

Moved range_str declaration down
CesiumLifeJacket
committed

Commits on Aug 18, 2015

Commits on Sep 5, 2015

minor bug fix
CesiumLifeJacket
committed

Commits on Dec 26, 2015

Commits on Dec 28, 2015

added schema_type attribute to SchemaMismatch
CesiumLifeJacket
committed

Commits on Dec 29, 2015

rework of exception classes
CesiumLifeJacket
committed

Commits on Jan 4, 2016

added error attribute to SchemaMismatch
CesiumLifeJacket
committed