Fix OS X issue: window start in foreground

When run from command line, the window starts behind all other windows.
raise_() will bring the window to the front.
re-enable seed tests. get_public_keys method
check seed in gui. fixes #622
Merge pull request #644 from wozz/raise_window

Fix OS X issue: window start in foreground
broadcast tx in a separate thread
rename do_send as send. fixes #645
Litecoin: i18n hack for upstream translations
Merge remote-tracking branch 'upstream/master'