Add gcc48 component
Merge pull request #691 from pyhalov/gcc48

Add gcc48 component
Switch default compiler to gcc 4.8.x
Merge pull request #692 from pyhalov/gcc48

Switch default compiler to gcc 4.8.x
Use Perl 5.16 for system-tools-backend - fixes "Users and groups" tool
Merge pull request #693 from pyhalov/system-tools-backends

Use Perl 5.16 for system-tools-backend - fixes "Users and groups" tool