Feature/fix readmes

Two overall topics:
1) Tags such as in the statement: "pipes.<pipe1-name>.source.work_dir=<source-work-directory>" were being omitted by Github markdown, so I surrounded those types of statements with triple `.

2) Modify python stream client README to more accurately reflect the java stream client's (https://raw.githubusercontent.com/caskdata/cdap-ingest/release/1.0.0/cdap-stream-clients/java/README.md)