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Sorry for the big PR, the housekeeping and vector cleanup work were pretty co-dependent.\n\nJIRA issues addressed by this PR:\n[ARROW-1032](https://issues.apache.org/jira/browse/ARROW-1032) - Support custom_metadata\n[ARROW-1651](https://issues.apache.org/jira/browse/ARROW-1651) - Lazy row accessor in Table\n[ARROW-1652](https://issues.apache.org/jira/browse/ARROW-1652) - Separate Vector into BatchVector and CompositeVector\n\nTasks from the roadmap (some not in JIRA):\n\n##### Housekeeping\n1. Enable the strict-mode tsc compiler settings in the build\n2. Compile mjs files for node 8.x ESModules\n3. Compile ES6 UMD target with native iterators/generators\n\n##### Vector\n1. Refactor Vector types to primitive forms representing the portion of a column in a single RecordBatch\n2. Add Column Vector that represents primitive Vectors across RecordBatches as an entire column\n3. Refactor linear column-to-batch-index lookup in `Vector.get(i)`\n4. 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