adding PyYaml
removing doc strings that are no longer relevant
adding the INTERACTIVE_INTERPRETER constant
Disable all logger styling for interactive mode or when using a debugger.  It messes up sys.ps1 and other formatting, especially on Windows.
removing accidental change
Merge pull request #26 from pyfarm/logger_color_non_interactive_only

Remove Logger Color For Interactive Interpreters/Debuggers
adding retries for pip
adding missing : in travis.yml