[2.0] Fixed issue with RunSqlTask. Added basic support to --update in SchemaToolTask. Misses some internal implementation

[2.0] Updating sandbox cli to use APC again but adding comment to use ArrayCache if APC is not available

[2.0] Changing sandbox to use ArrayCache by default so it doesn't require APC. Added comment with APC as the recommended for production

[2.0] Updated description for pear packages. Enhanced ClassLoader to support the old namespace separator (underscore) for Zend/PEAR/... compatibility until some day when they all use 5.3+.

[2.0] Work on CLI: Added SchemaToolTask with preliminary support for dropping/creating the database schema. Prepared the sandbox. Adjusted build to include the sandbox.

[2.0] Various necessary fixes and adjustments for oracle as well as fixes for better handling of temporal types. Closed #2452.

[2.0] Made MySqlPlatform default to innodb table engine. Some cleanups while investigating the optimistic locking failures.

[2.0] Moved beginTransaction() in UnitOfWork#commit() out of the try block so that exceptions occuring during prior or on transaction start are not masked by another exception.

[2.0] Implemented base of CLI tasks. Also included drafts of Version and Help tasks. Implemented two Printers: Normal and ANSI Color.

[2.0] Removed *where*In methods from QueryBuilder. Finished decouple of QueryBuilder and Expr. Updated docs.