move constants to lib root

src/constants/default_settings.js

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+export default {
+  DEFAULT_SETTING_TIMEOUT: 10000,
+  DEFAULT_SETTING_INTERVAL: 'week',
+  DEFAULT_SETTING_DOCTYPE: 'esqueue',
+};

src/constants/events.js

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+export default {
+  EVENT_QUEUE_ERROR: 'error',
+  EVENT_JOB_CREATED: 'job:created',
+  EVENT_JOB_ERROR: 'job:error',
+  EVENT_WORKER_ERROR: 'worker:error',
+  EVENT_WORKER_COMPLETE: 'worker:job complete',
+  EVENT_WORKER_JOB_CLAIM_ERROR: 'worker:claim job error',
+  EVENT_WORKER_JOB_SEARCH_ERROR: 'worker:pending jobs error',
+  EVENT_WORKER_JOB_UPDATE_ERROR: 'worker:update job error',
+  EVENT_WORKER_JOB_FAIL: 'worker:job failed',
+  EVENT_WORKER_JOB_FAIL_ERROR: 'worker:failed job update error',
+  EVENT_WORKER_JOB_EXECUTION_ERROR: 'worker:job execution error',
+  EVENT_WORKER_JOB_TIMEOUT_ERROR: 'worker:job timeout',
+};

src/constants/index.js

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+import events from './events';
+import statuses from './statuses';
+import defaultSettings from './default_settings';
+
+export default Object.assign({}, events, statuses, defaultSettings);

src/constants/statuses.js

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+export default {
+  JOB_STATUS_PENDING: 'pending',
+  JOB_STATUS_PROCESSING: 'processing',
+  JOB_STATUS_COMPLETED: 'completed',
+  JOB_STATUS_FAILED: 'failed',
+  JOB_STATUS_CANCELLED: 'cancelled',
+};