Naming series by fiscal year

This would solve #1525

Example:
Default naming series of Sales Invoice is set to SINV-
On completing Setup Wizard, the code will add another option in the naming series field: SINV-2014-2015-

So when creating a Sales Invoice, there will be two options:
SINV-
SINV-2014-2015-

which will create SINV-2014-2015-00001. Seems too long, doesn't it?
So, should I just remove naming series based on Fiscal Year feature? or we go along with this pull request?

@nabinhait, @rmehta - your thoughts?