Refactored connector to improve concurrency

• changed implementation of connector to singleton

Mendix 7 - get user and channel names

• Upgrade to Mendix 7.0
• Get username for user id
• Get channelname for channel id

Release 1.1 - Slack listener

• Register a microflow to be called on receiving a message from slack

Initial release Mendix Slack connector

The 1.0 release of the Mendix Slack connector provides basic integration with slack:

• post a message to a slack channel
• send a direct message to a slack user