release: update release script

work in progress
Release: script release ok for major and minor
Merge branch 'release' into dev
Merge branch 'release' into dev
Merge pull request #349 from antoine-de/NAVITIAII-770

Navitiaii 770
Merge pull request #350 from antoine-de/fix_journeys_filter

Jormungandr: filter similar journeys
Merge branch 'release' into dev
Jormungandr: remove useless variable
Merge pull request #351 from l-vincent-l/remove_useless_variable

Jormungandr: remove useless variable
Update readme.rst

Add alternatives
Tyr: add load_data target

add a new target to tyr:
load_data
called with a kraken instance and a data dir.

Launch the data import chain for all the files of that directory
Kraken: force malloc release

when we reloaded the kraken's data with tyr the memory foot print was
twice as big as the real data.

We now force malloc to release the free memory after the swap to reduce
the overall kraken memory foot print.
Merge pull request #353 from antoine-de/force_malloc_release

Kraken: force malloc release
Tyr: do not backup file for load_data target
documentation: synthese presentation modif
documentation: mumoo presentation
Merge pull request #355 from CanalTP/doc_modification

documentation: synthese presentation modif
Tyr: add comment to import_data function
Merge pull request #354 from antoine-de/tyr_load_data

Tyr load data
Release script: correction of a typo