Update pear-MDB2_Driver_pgsql to 1.5.0b4 and add LICENSE.

Changelog:

- Remove assignment by reference, Bug #19585.
- PEAR::isError() -> MDB2::isError(), Bug #19491.
- PEAR::loadExtension() -> extension_loaded(), Bug #19583.
- Fixed boolean type conversion for non-boolean types
- Fix Bug #19262. Updates conditional stagements to use logical operators to
  include MDB2_FETCHMODE_OBJECT where appropriate. Was broken in r321197.
- Request #12931 Add cascading to dropTable?
- Have truncateTable() return MDB2_OK on success, as documented (bug 19201)
- Have vacuum() return MDB2_OK on success, as documented (bug 19196)
- Have dropConstraint() return MDB2_OK on success, as documented (bug 19194)
- Have createSequence() return MDB2_OK on success, as documented (bug 19192)
- Have dropSequence() return MDB2_OK on success, as documented (bug 19191).
- Make setOption('result_wrap_class') actually useful by changing the default
  value of $result_wrap_class parameters from false to true.
- Have pgsql only read LOB from file if lob_allow_url_include (bringing it in
  line with other drivers).
- FETCHMODE constants are NOT bitwise.
- fixed bug #18203: Type introspection breaks with associative arrays if names
  are identical (patch by Peter Bex)
- fixed bug #17890: Improper use of array_search in prepare function
  [fletcherj]
- fixed bug #17890: Improper use of array_search in prepare function
  [fletcherj]

open todo items:
- enable pg_execute() once issues with bytea column are resolved
- use pg_result_error_field() to handle localized error messages (Request
  #7059)
- add option to use unnamed prepared statements (see
  http://www.postgresql.org/docs/current/static/protocol-flow.html
  "Extended Query")

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