Upgrade hull-node

• upgrade hull-node

Fix preview problems with accounts and filter notifications channels

Merge pull request #62 from hull-ships/feature/restrict-subscriptions

Restrict subscriptions to user:update only

Fix sandbox and more request metrics

Merge pull request #56 from hull-ships/hotfix/v0.2.17

Sandbox fixes and more metrics

Add nodejs memory optimization runtime flags

Merge pull request #54 from hull-ships/hotfix/v0.2.16

Add nodejs memory optimization runtime flags

Upgrade NodeJS to v8.10.0

Merge pull request #53 from hull-ships/hotfix/v0.2.15

Hotfix/v0.2.15

Hotfix and refactor release

• [improvement] Upgrade code to node v8.9.x LTS release
• [improvement] Use customizable tabs for code editor
• [bugfix] Fix failing code syntax check
• [bugfix] Fix failing initial user load
• [maintenance] Re-factoring of code base for better readibility and maintainability
• [maintenance] Additional tests for linting and syntax checking of more complex code
• [maintenance] Exclude selected events from events array (see README.md Notes section for details)