INT-3074: JDBC: Make generateSql as UP-TO-DATE

* remove `overwrite: 'true'` from `generateSql` task
* add `cleanSql` task

JIRA: https://jira.springsource.org/browse/INT-3074
INT-3170 Update Project Repo in Root Files

s/SpringSource/spring-projects/
INT-3171: Polishing Aggregator tests

* Increase waiting timeouts
* Get rid of `Thread.sleep` when it's dangerous

JIRA: https://jira.springsource.org/browse/INT-3171
INT-2866: Add (S)FTP `local-directory-expression`

* Add `local-directory-expression` to (S)FTP Outbound Gateways
* Add `FtpServerRule` to Apache Mina embedded FtpServer
* Add tests for (M)GET and `local-directory-expression`:
FTP tests uses `FtpServerRule`, SFTP tests need testing on real SFTP server

JIRA: https://jira.springsource.org/browse/INT-2866

INT-2866: Documentation

INT-2866 Polishing

- Remove leading /
- Change \ to / in invalid test
- Clean up after sftp

Tested with real SSH.

INT-2866 Polishing - Add Mock SFTP Test

Run with -Dspring-profiles-active=realSSH to run with a real SSH server.

Assumes ftptest/ftptest account on localhost with the following directory tree in the user's root...

  $ tree sftpSource/
  sftpSource/
  ├── sftpSource1.txt
  ├── sftpSource2.txt
  └── subSftpSource
      └── subSftpSource1.txt

INT-2866: Polishing

INT-2866: change `remotePath` to `remoteDirectory`

Doc Polishing.
INT-3172 (S)FTP - Add Recursion Option to LS Cmd

When recursing, the returned filenames are relative to
the top level directory.

INT-3172 (S)FTP - Add Recursion to MGET Command

https://jira.springsource.org/browse/INT-3172

INT-3172 Polishing

- PR Comments
- Add Tests for SFTP (tested with Mock and real SSH)
- Enhance test to ensure subdir is in 3rd file retrieved
- Exclude "special" directories ('.' and '..') from recursion

INT-3172 Make FtpServerRule Safe For Concurrency

Previously the port was static.

- Make the port an instance variable
- Channel the `@ ClassRule` to a `@ Rule`
- Register an appropriate DefaultFtpSessionFactory bean declaration

INT-3172 Polishing; Docs

- Rename FtpServerRule to TestFtpServer
- Remove restriction on filters for MGET
- Add test for filtered MGET
- Reference docs, what's new

INT-3172 More Polish

- Fix type in reference
- Fix error message now that filter is allowed with MGET
- Remove test for filter with MGET (now valid)

INT-3172: Fix tests and typos

INT-3172: this.remoteFileSeparator for recursion