RedMine issue #1910 - Generation of auth token for V1 executed via CURL

RedMine issue #1910 - Generation of auth token for V1 executed via CURL
BugIssue #1917 - Get the correct users version

BugIssue #1917 - Get the correct users version
Bug issue #1550 - Bug fix related to the compatibility of the plugin for v1 and v3 users

Bug issue #1550 - Bug fix related to the compatibility of the plugin for
v1 and v3 users
Merge pull request #5 from mailjet/development

Merge development with master