'correctly' pass exts_filter for Python packages
make easyblock for version-independent python packages truly version independent and fix shebang line for install Python scripts; deprecate VersionIndependendPythonPackage, replaced by VersionIndependentPythonPackage
add easyblock for installing vsc-* Python packages that include their own vsc namespace
add log.deprecated in VSCPythonPackage constructor
Merge pull request #348 from boegel/vscpythonpackage

fix VersionIndependentPythonPackage easyblock, add VSCPythonPackage easyblock