start of issue #19 added readProfessions in HDFSUtils to read in profession_train data
added method to write out profession count list (writeProfessions(String)) in HDFSUtils.java
#19 forgot to actually commit the changes, only commited the output file I had in the last commit
Merge remote-tracking branch 'origin/reading_training' into shlomo.merging.reading_training
#24: made readProfessions DRYer
#24: removed countLines(...) since readLines(...).size() would return the same
#24: renamed readProfessions(...) to getProfessionCounts(...) since the method is processing the file content. Also changed the writeProfessions(...) to writeProfessionCounts(...) and changed the key-value separating character to '\t' (tab) for easier reading in using the KeyValueTextInputFormat.