Flesh out naga.py:
 * Put optparse stuff in main()
 * Add connect()
 * Add __init__.py in naga/
More improvements to naga.py:
 * now actually uses ssh
 * add timecheck()
 * split option parsing into seperate method
 * use current user as default ssh username
Framework now complete.
 * added finish() method to calculate return code etc.
 * improved input parsing
 * load method now a 'working' stub
 * others still not implemented
naga.py: various minor changes
load: now implemented, switch load/info in declaration of finish()
Implement memory(), and other changes.
 * Move warn/crit interpretation to finish()
 * implement INFO_LEVELS dict to store warn/crit defaults
 * clean up decimal places in finish()
 * fix some bugs
update README