Base stacked processors are moved to bob.extension

See merge request !136

Make missing annotations None instead of empty dict

See merge request !135

Included metadata during the feature extraction.

See merge request !125

Created the method is_argument_available that checks if an argument is available for certain method. provided both python2 and python3 implementations

Used the new method is_argument_available

Used the new method is_argument_available

Improved the test cases

[sphinx] Documented the metadata info

Fixed issue in the projector metadata

Included metadata durint the feature extraction. Ongoing with cd workspace_HTFace/

Changed the paths to images

See merge request !134

Mentions bob.bio.vein on bob.bio.base docs (closes #104)

Closes #104

See merge request !133

Add annotator support

See merge request !131

This reverts commit 3fdb09c9.