2015.4: bump version number
2015.4: bump version number

sfepy/sfepy,sfepy/sfepy,BubuLK/sfepy,rc/sfepy,rc/sfepy,vlukes/sfepy,lokik/sfepy,BubuLK/sfepy,BubuLK/sfepy,lokik/sfepy,sfepy/sfepy,vlukes/sfepy,vlukes/sfepy,lokik/sfepy,lokik/sfepy,rc/sfepy