SHA1: Fixed documentation of length parameter for encode function.

The length parameter is obviously used for data_in not for data_out as data_out is always the same length with sha1.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Session: Fixed the problem with session init.

Session init did not save the correct path using store_name in session_store_path.
All session files were getting stored in /dev/shm/duda_session instead of /dev/shm/duda_session/store_name.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Merge pull request #14 from matematik7/master

SHA1, Session: Fixed documentation for SHA1 encode function and a problem with session init.