Preprocessing step for Spark history file processing
Updating comments (hadoop version to history file type), updating variable names,adding a Spark Job Desc Factory class
Updating formatting
Adding in the processing step and unit tests, changes to JobDescFactory
Update spark_1413515656084_3051855
Updating exception logging and if check styles as per review comments
adding in comments for explaining constant values
Merge branch 'preprocess_spark' of https://github.com/vrushalic/hraven into preprocess_spark
Updating one field in rest response
Merge pull request #124 from vrushalic/preprocess_spark

Spark history file processing
Release version for 0.9.17.t01
Next snapshot version for dev