Added stubs for count function and counting reducer
Added word count example using the counting of group elements.
Added IT Case for count() agrgegation function.
Minor changes in RemoteExecutor.java and LocalExecutor.java. Removed obsolete null-value check in the finally clauses in LocalExecutor.java. Returning proper exit code in RemoteExecutor.java.
Rename Record*Format to Csv*Format in scala frontend
Adjusted test to new output format names.