put generated documentation in 'build', don't clutter the docs directory
completely rework install+upgrade documentation so it is easier to follow and explains the current set of best practices:
- usage of system-provided tools wherever possible (long-term security, less work)
- separate data and source code (simpler upgrades, multi-instance hosting with the same source code)
- generate a deployment.ini as early as possible so that users don't run with insecure settings
- remove description for unrelated tasks (e.g. configuring a MySQL server)
- updated system-specific description for Mac OS X (homebrew), Fedora, CentOS, Debian, and Ubuntu

improve deployment documentation:
- number of mod_wsgi processes
- recommend mod_wsgi as preferred deployment option
- don't mention auto-reload feature of mod_fastcgi (it was disabled by default and hopefully everyone switched to mod_fcgid anyway)
bump version to 0.10dev
ignore build directory