Issue #85: Keep environment variable PYTHONHOME. This variable is ignored by bootloader for the frozen executable.
Issue #85: Add modulegraph 0.12 and altgraph 0.12 from git.
Issue #85: And some Python 2 notes to bootloader code and improve Python 2 compatibility.
Issue #85: Set for the frozen executable sys.prefix, sys.exec and sys.base_prefix, sys.base_exec_prefix.
Issue #85: Fix some basic tests for Python 3.
Merge remote-tracking branch 'upstream/modulegraph' into modulegraph
Issue #85: Fix test basic/test_module_attributes.py.
Fix _format_hook_datas

Fix the previous fix of _format_hook_datas

Move the files into there containing folder now.
Merge remote-tracking branch 'upstream/modulegraph' into modulegraph