Correction de l'import optionnel de gdal dans la lib storage

Correction d'une erreur de tag

Merge pull request #91 from rok4/develop

Release 2.2.0

Merge pull request #91 from rok4/develop

Release 2.2.0

Merge pull request #87 from rok4/develop

Release 2.1.5

Merge pull request #85 from rok4/develop

Release 2.1.4

Merge branch 'master' of github.com:rok4/core-python

Merge pull request #73 from rok4/develop

Release 2.0.1

Merge pull request #62 from rok4/develop

Release 2.0.0

Merge pull request #61 from rok4/feature/storage-read-optimization

Client S3 avec connexions ouvertes et cache LRU de lecture