Support for configuration files

See merge request !13

# Conflicts:
#   bob/pad/base/test/dummy/database.py
#   bob/pad/base/test/dummy/database_sql.py

Fix issue bob.db.base#16

Closes bob.db.base#16

See merge request !11

Added the High Level Database Interface How-To Guide to the documentation

See merge request !10

Adding support for Filelist-based databases

See merge request !9

Adds annotations for PAD (similar to bob.bio.base)

See merge request !8

Iso metrics

This branch includes code for computing ISO metrics APCER and BPCER. Please merge it to master.

See merge request !6

Fix licensing in files and readme



See merge request !5