Fixing two broken links in the User Guide.
Fixed incorrect documentation for decimal validator
Suhosin compatible emails

Fix problems with Suhosin and sending emails trough php mail()
Merge pull request #2584 from PlamenVasilev/2.1-stable

Suhosin compatible emails
Merge pull request #2577 from chrishepner/2.1-stable

Fixed incorrect documentation for decimal validator
Bugfix on truncate command
Fix on sqlsrv_forge drop_table
Style correction
removed unnecessary assignment
Bugfix on the sqlsrv forge driver create_table function
Bugfix on the sqlsrv forge driver rename_table function
Bugfix on the active record join statement with empty conditions
Revert "Bugfix on the active record join statement with empty conditions"

This reverts commit 2cfbfc54dc68d9e7ed7c20af4cf7693736bbd447.
Revert "Bugfix on the active record join statement with empty conditions"

This reverts commit 2cfbfc54dc68d9e7ed7c20af4cf7693736bbd447.
Merge branch 'upstream_21' of https://github.com/blowdoof/CodeIgniter into upstream_21
Added changelog entries
Merge pull request #2689 from blowdoof/upstream_21

Bugfix 2.1 sqlsrv driver
Fix some spacing issues from PR #2689
Merge remote-tracking branch 'upstream/2.1-stable'

Update CI PDO with upstream changes.