Multiple changes made while setting up the site

...from scratch on Rika

The plugins directory has been changed to match the repo cloned from
Github.

Added a new package 'flup' to the requirements list.

Changes in the generate script:

    Regular expressions now take into account the _() translate function.

    .git directory is ignore

    Fixed a bug in the command line arguments

Minor refactoring in other files.
Added Installation Guide