Arrow release 0.1

[asfimport]

Reporter: Julien Le Dem / @julienledem
Assignee: Julien Le Dem / @julienledem

Related issues:

• Fix Arrow pom for release (is blocked by)
• JSONScalar is unnecessary and unused. (is blocked by)
• Fix Arrow licences (is blocked by)
• create arrow folder under http://www.apache.org/dist/ (is blocked by)
• [Format] Add some form of user field metadata to IPC schemas (is blocked by)
• Add a typeids Vector to Union type (is blocked by)
• [Format] Define more generic Interval logical type (is blocked by)
• Make parquet-cpp an optional dependency of pyarrow (is blocked by)
• Finalize timestamp type (is blocked by)
• create release scripts (is blocked by)
• create arrow folder under https://dist.apache.org/repos/dist/dev (is blocked by)
• Enable Nexus Access For Arrow (is blocked by)

_{Note: This issue was originally created as ARROW-272. Please see the migration documentation for further details.}