Improve the installation instructions

Closes #72 and #69

See merge request !72

removed unnecessary commands starting with ./bin/

See merge request !71

Slightly updated the doc of objects() function in BioDatabase class

See merge request !70

Fix typo in docs

See merge request !67

First simple version of writing empty configuration files

Closes #45

See merge request !65

Merge branch '62-preprocessing-extraction-and-projection-will-not-stop-if-files-are-missing' into 'master'

raising errors instead of emitting warnings in case of unsuccessful processing

Closes #62

See merge request !63

Fix documentation of annotations method

See merge request !66

Resolve "Base classes are not new-style classes"

Closes #64

See merge request !64

Implemented check that all configuration file variables are consumed (passes also when overwritten on the command line)

Update requirements.txt - remove gridtk

Closes #49

See merge request !61

The little typo was corrected

See merge request !60

Changed the referece files for PLDA

Closes #61

See merge request !62

Merge branch '59-strange-behaviour-when-retrieving-objects-from-bob-bio-base-filelist-database-query' into 'master'

Resolve "strange behaviour when retrieving objects from bob.bio.base filelist database query"

Closes #59

See merge request !59

You can now specify a minimum file size for saved files

See merge request !58