[sphinx] Documented the metadata info

Fixed issue in the projector metadata

This reverts commit 3fdb09c9.

Removed global variable results

Using config file loading mechanism from bob.extension

Used the bob.extension config file loading

Removing an awesome feature implemented in 2 lines of code

Integrated with bob.extension merge 58

[sphinx] Added some documentation about chain loading

Fixed import

Documented configuration file as the default way of running experiments; other small documentation changes and corrections

remove matplotllib rc modifications since these can be changed with an rc file without modifying the code