print versions in short brief,   add --more option to show full of them.
Adjust pear config after installation.
1.12 changelog
allow variant inheritance
Merge pull request #145 from rado-h/develop

allow variant inheritance
expand tab
document variantBuilder
document VariantBuilder::build method
read build meta from installation prefix.
import variantFromFile method to read installed configure variants
TODO about the variant info file.
Merge branch 'develop' into refactoring-tasks

Conflicts:
	src/PhpBrew/Build.php
	src/PhpBrew/Command/InstallCommand.php