added anaconda-1.9.2
Merge pull request #155 from uhpnou/master

added anaconda-1.9.2
Update existing git repo if exists.

The destination repository might exist if the `--keep` was given to
`python-build`.
*EXPERIMENTAL* Add https://github.com/dropbox/pyston
Fix broken `pyston` script
Enable `ccache` during pyston builds
Use `yyuu/pyston` to avoid patching