Deprecate SimpleJdbcTestUtils in favor of JdbcTestUtils

Several static utility methods in SimpleJdbcTestUtils accept an instance
of SimpleJdbcTemplate as an argument; however, SimpleJdbcTemplate has
been deprecated since Spring 3.1 in favor of simply using JdbcTemplate
which now also supports Java 5 language constructs such as var-args.
Consequently, use of such methods from SimpleJdbcTestUtils results in
deprecation warnings without an equivalent API to migrate to.

This commit addresses this issue by migrating all existing methods in
SimpleJdbcTestUtils to JdbcTestUtils. The migrated methods now accept an
instance of JdbcTemplate as an argument, thereby avoiding the
deprecation warnings but maintaining semantic compatibility with the
functionality previous available in SimpleJdbcTestUtils.

In addition, this commit also introduces two new methods:

 - countRowsInTableWhere(): counts the rows in a given table, using
   a provided `WHERE` clause
 - dropTables(): drops the tables with the specified names

Issue: SPR-9235
Merge pull request #90 from ianbrandt/SPR-9235

* SPR-9235:
  Deprecate SimpleJdbcTestUtils in favor of JdbcTestUtils
Provide JdbcTemplate in tx base classes in the TCF

Since Spring 2.5, the abstract transactional base classes in the
TestContext framework have defined and delegated to a protected
SimpleJdbcTemplate instance variable; however, SimpleJdbcTemplate has
deprecated since Spring 3.1. Consequently, subclasses of
AbstractTransactionalJUnit4SpringContextTests and
AbstractTransactionalTestNGSpringContextTests that use this instance
variable suffer from seemingly unnecessary deprecation warnings.

This commit addresses this issue by introducing a protected JdbcTemplate
instance variable in abstract transactional base classes to replace the
use of the existing SimpleJdbcTemplate. Furthermore, the existing
simpleJdbcTemplate instance variable has been deprecated, and utility
methods in the affected base classes now delegate to JdbcTestUtils
instead of the now deprecated SimpleJdbcTestUtils.

Issue: SPR-8990
Introduce new methods in tx base test classes

Recently new utility methods were added to JdbcTestUtils, and a
JdbcTemplate was introduced in abstract transactional base classes in
the TestContext framework. This presents an easy opportunity to make
these new utility methods available as convenience methods in the base
test classes.

This commit introduces new countRowsInTableWhere() and dropTables()
convenience methods in the abstract transactional base classes in the
TestContext framework. These new methods internally delegate to methods
of the same names in JdbcTestUtils.

Issue: SPR-9665
Modify SpEL Tokenizer to support methods on numbers

When attempting to parse an Integer literal expression such as
42.toString(), SpEL currently throws a SpelParseException with a message
similar to: "EL1041E:(pos 3): After parsing a valid expression, there is
still more data in the expression: 'toString'". The problem here is that
'3.' is currently considered a valid number (including the dot).
However, SpEL succeeds at parsing an equivalent expression for a Double
literal such as 3.14.isInfinite().

To address this issue, the SpEL Tokenizer no longer consumes the
trailing '.' on an integer as part of the integer. So '3.foo()' will now
be parsed as '3' '.' 'foo()' and not '3.' 'foo()' -- which was what
prevented parsing of method invocations on integers. To keep the change
simple, the parser will no longer handle real numbers of the form
'3.e4'. From now on they must include the extra 0 (i.e., '3.0e4').

Issue: SPR-9612
Merge pull request #112 from aclement/SPR-9612

* SPR-9612:
  Modify SpEL Tokenizer to support methods on numbers
Refactor Servlet 3 async support

As a result of the refactoring, the AsyncContext dispatch mechanism is
used much more centrally. Effectively every asynchronously processed
request involves one initial (container) thread, a second thread to
produce the handler return value asynchronously, and a third thread
as a result of a dispatch back to the container to resume processing
of the asynchronous resuilt.

Other updates include the addition of a MockAsyncContext and support
of related request method in the test packages of spring-web and
spring-webmvc. Also an upgrade of a Jetty test dependency required
to make tests pass.

Issue: SPR-9433
Support case-insensitive null literals in SpEL

Prior to this commit null literals in SpEL expressions had to be
specified as "null" (i.e., all lowercase).

With this commit null literals in SpEL expressions are interpreted in a
case-insensitive manner, analogous to the current support for boolean
literals.

Issue: SPR-9613
Merge pull request #113 from aclement/SPR-9613

* SPR-9613:
  Support case-insensitive null literals in SpEL
Polish GenericTypeResolver

 - renamed resolveParameterizedReturnType() to
   resolveReturnTypeForGenericMethod()
 - fleshed out Javadoc for resolveReturnType() and
   resolveReturnTypeForGenericMethod() regarding declaration of formal
   type variables
 - improved wording in log statements and naming of local variables
   within resolveReturnTypeForGenericMethod()

Issue: SPR-9493