[enh] implemented --outfile param
[enh] added keysigning and checking sigs
[enh] added seperate master key handling for key sigs/verify
Merge branch 'outfile' of https://github.com/dnet/pbp into dnet-outfile

Conflicts:
	pbp.py
[mod] renamed test directory
[mod] prefixing passphrase query with purpose
[doc] autorunning test.sh on install
[doc] update
[doc] update
[enh] added experimental pfs mode
[mod] removed debug
[enh] added tests for experimental pfs mode
[enh] simplified string emptyness check
[fix] avoid exception in getpkeys if directory doesn't exist
[fix] avoid exception in getskeys if directory doesn't exist
[enh] use set instead of list in getskeys
[enh] extracted methods get_{p,s}k_dir
[enh] use 'is not' to test against None instead of !=
[enh] added test suite