./bin/keystone doesn't work - wrong database used

The simplest approach to solve this issue is to either:

A) change the default sqlite db location in keystone.conf to an absolute path, such as `/tmp/keystone.db` (which I presume is an appropriate path for development/testing purposes)

B) change the default sqlite db location to simply be in the current working directory, such as `keystone.db`

For platform independence, I'm going to go with option B at this point.

sampledata.sh can also only be executed within bin/, so I'll include a fix for that as well.

(note that keystone.log is currently written to the current directory as well, by default)

Fixes included in current pull request, as described above.