Added UI elements not intergrated into app
Merge pull request #40 from ColinRoberts/master

UI elements added; not yet integrated into the app
Merge pull request #41 from maxluzuriaga/master

Username/tags validation, tags controller changes, many many tests.
Fixed Library and Parsing Errors

There's still an error in the JawnAdapter, but that might be beyond my
expertise
Merge pull request #42 from sbeckley/master

Fixed Library and Parsing errors
Added content_type and spark_type validation on Spark.
Changed spark_type and content_type to only be one character long in the database.
Updated tag_text and username validation messages to match up with normal style of error messages.
Fixed redundant content_type validations.