Scrape

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- added requests to install_requires in setup.py

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- added attributes flag which specifies which tag attributes to extract from a given page, such as text, href, etc.

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- updated flags and flag help messages
- verbose now by default and reduced number of messages, use --quiet to silence messages
- changed name of --files flag to --html for saving output as html
- added --text flag, default is still text

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- fixed character encoding issue, all unicode now

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- improvements to exception handling for proper PART file removal

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- pages are now saved as they are crawled to PART.html files and processed/removed as necessary, this greatly saves on program memory
- added a page cache with a limit of 10 for greater duplicate protection
- added --files option for keeping webpages as PART.html instead of saving as text or pdf, this also organizes them into a subdirectory named after the seed url's domain
- changed --restrict flag to --strict for restricting the domain to the seed domain while crawling
- more --verbose messages being printed