Feature/improve twitter sentiment app

Various improvements to the TwitterSentiment App: …
-simplify logic in Normalization Flowlet.
-route the TweetCollector directly to the PythonAnalysisFlowlet.
-rename flowlets to be more informative and consistent with our naming convention.
-remove 'withResources' in flowBuilder, procedureBuilder. reason: deprecated.
-remove package-info.java
-@Batch processing in flowlet: Iterator<Tweet>   ->   Tweet
-fix format of pom.xml, move version into properties
README already updated:
https://github.com/caskdata/cdap-apps/pull/27/files#diff-1