update README to include use of install scripts

install script -- add install XCode Command Line Tools

add install and uninstall scripts

do not force START_URL for bin when only listing content types

add install OS X command line tools

update github clone

update dependent packages

update README so that Pip is only installed if it needs to be

fix README styling

more README updates

update README

Readz/Readz#7000 -- update README

Readz/Readz#7000 -- build and install package with setup.py

Readz/Readz#7000 -- track sites visited, requested, and parsed

Readz/Readz#7000 -- refactor