add implementation of hashcodebuilder,equalsbuilder and tostringbuilder
using commons-lang library.
TODO: implement all this on every entity classes

git-svn-id: https://brain-invoice.googlecode.com/svn/trunk@8 e6ef879c-6efb-f92a-4ca0-37fcd3c99b0e
Merge https://github.com/yudhik/brain-invoice

Conflicts:
	brain-invoice-model/src/main/java/com/brainmaster/apps/invoicing/model/id/AccountKeys.java
	brain-invoice-model/src/main/java/com/brainmaster/apps/invoicing/model/id/BrandAccountKeys.java

git-svn-id: https://brain-invoice.googlecode.com/svn/trunk@9 e6ef879c-6efb-f92a-4ca0-37fcd3c99b0e
Merge https://github.com/yudhik/brain-invoice
add new implementation, buggy in joining many to many with multiple
primary key