Rewrite virtualenv support. Add cache for find fabfiles and fab bin queries.
Remove prints from cache code and do some pep8 format imprv
remove unused asyncproc.py module
Pep8
some optimization
add first version of caching tasks
Removed the questionable caching fab files. Added caching tasks by abs name of fabfile.py
Edit doc sting of method FabricWrapper._get
Merge pull request #6 from zerc/master

Some improvements