Merge pull request #2 from jonasschnelli/bitcoinj_autosave

BitcoinJKit set bitcoinj wallet to autosave
allow more filename/folder flexibility

this pull request does allow to set the support directory folder name as well as the app name for creating <NAME>.wallet and <NAME>.spvclient files.

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>