Merge pull request #33 from cassandra-project/develop

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Merge pull request #34 from cassandra-project/develop

Develop
Minor change in Constants.java

Minor change in Constants.java so that the returned JSON matches the
rest JSON responses (when success : false)
Merge pull request #35 from cassandra-project/develop

Change reading json schemas via URL into reading them via the file
Minor change in Runs.java (JSON response on failure)

Again I replaced exception with errors so that all failure respones have
the same format.
Closed #147 #142 #140 #58
Merge pull request #161 from fgiannar/develop

Develop