Added tons of documentation

bob/bio/base/algorithm/__init__.py

bob/bio/base/extractor/__init__.py

bob/bio/base/grid.py

bob/bio/base/preprocessor/__init__.py

bob/bio/base/script/resources.py

bob/bio/base/tools/__init__.py

bob/bio/base/tools/command_line.py

bob/bio/base/tools/grid.py

bob/bio/base/utils/resources.py

doc/conf.py

doc/experiments.rst

doc/implementation.rst

doc/implemented.rst

doc/index.rst

doc/installation.rst

doc/links.rst

doc/py_api.rst