current_timestamp now using timestamptz + adding localtimestamp for timestamp
Merge pull request #16 from balat/master

current_timestamp now using timestamptz + adding localtimestamp for time...
Merge branch 'oasis'
Merge branch 'ordering'
Merge branch 'agg'
Merge branch 'in'
support unary operators (BREAKING CHANGE)

<:value< current_timestamp >> was previously special-cased in the
grammar to expand to Sql.Op.current_timestamp, while other identifiers
were interpreted as row names. I removed this special case and added
a `unit` value in SQL-land, so you can now write

  <:value< current_timestamp () >>
Merge branch 'unary_ops' of https://github.com/ocsigen/macaque

Conflicts:
	src/sql.mli
	src/sql_internals.ml
	src/sql_types.ml