fix NULL / NOT NULL clause for column alterations in Oracle
fix column comment lifecycle
normalize asset names consistently
fix explicit case sensitive identifiers in Oracle
revert identity sequence naming strategy on Oracle to keep BC
use identity sequence name for generating SQL to drop an autoincrement from a column
fix table diff's new name if it is not set
Merge pull request #676 from deeky666/DBAL-831

[DBAL-831] Fix explicit case sensitive identifiers in Oracle
Merge pull request #687 from deeky666/DBAL-1001

[DBAL-1001] Fix NULL / NOT NULL clause for column alterations in Oracle
Merge pull request #692 from deeky666/DBAL-1009

[DBAL-1009] Fix column comment lifecycle
Moving HHVM+mysql back to allowed failures: we need green builds to keep moving (for now)
`false` is not a valid type: replacing with `boolean`
Merge branch 'hotfix/#696-DBAL-1013-table-diff-new-name-may-not-be-set'

Close #696