* Improve handling of ImportErrors to notify users that they need to install new dependencies
Also added missing dependency to requirements.txt
* Mention installing dependencies in virtualenv if used
* Move requirements used only by output modules to a separate file
* Using a virtualenv is now the only officially supported method
* Handle ImportErrors when loading output plugins so different install instructions can be given
* Cleanup requirements-output.txt
* untested improvements to Install.md
* fixed missing pycrypto in requirements.txt
* table of contents
* removing citation
* beautification
* remove red hat instructions (they were wrong)
* PYTHONPATH might need to be set regardless
* bugfix
* reorganize, sweeping improvements
* finishing touches