best practice for migrating from mysql
updated changelog according to 0.45.2 release
add mongodb migration docs
update readme
added more examples for string literals

link to csv2json.py in mysql best practice
added note that the admin interface runs on each node
Merge pull request #1314 from crate/h/obj-literal

object literal example and other documentation improvements
restructure develop.rst and extend contribute.rst
added documentation for table column policy
add columnPolicy property to TableInfo
implemented creating tables with 'strict' or 'dynamic' column_policy
added partitioned table integration tests
made ReferenceInfo use new ColumnPolicy enum
Added support for column_policy in ALTER TABLE
added support for reseting column_policy
rebased master into strict table
added changes for column policy
WIP: added docs about safety and liveness guarantees