Code generation

Added some utility classes for code generation to common-spring:

• com.foreach.common.spring.code.MappedStringEncoder can encode a number to a string and back, using a mapping matrix 
• com.foreach.common.spring.code.CodeGenerator generates random codes as numbers that are mapped using the MappedStringEncoder specified

The new utilities can easily be used to generate codes with a fixed length and format.

Exception filtering

The ExceptionToMailResolver now supports an ExceptionPredicate property to filter the exceptions for which mails should be sent.  Default implementations IncludedExceptionPredicate and ExcludedExceptionPredicate are provided.

Issue list

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