- db.R
  - Modified to change job_id -> set_id as the 'default' group of data to work with.
  - Added:
    * createSet
    * saveWorkerMetrics
    * getWorkermetrics

- dataproc.inc: changed the purpose of the library: now it's used to access (analysis) data stored on the database.
  - getSetId
  - getJobsInSet
  - getFilteredSentences
  - getAvgWorkerMetricsSet: retrieves the average metrics across one set. It's only an overview (hence avg, not completely metrics).
  - getAvgWorkerMetricsJob: retrieves the worker metrics for one specific job.
  - getCrossJobWorkers: returns the list of workers who have made judgments in several jobs of the set.
  - getCompletionTimeStats: returns task completion stats for a list of job_ids (from the history table).
  - getSetCompletionTimeStats: Returns task completion time stats for one set (the average of the jobs that form the set).
  - getJudgmentsPerJob:  Get the number of judgment per job, for a list of job_ids. (Stored on the history table).
  - getCrossJobStats: Calculates the min,avg,max number of jobs completed for crossjob workers.

- lib/filters.R: added filter for outliers.
- lib/fileStroge.R: creation of histograms.
Merge branch 'master' of https://github.com/laroyo/watsonc