Adjusted the README.md.
Adjusted the README.md.

The readme is now closer to how we
build and run shuttl. Also changed
the supported Hadoop version from
1.0.0 to 1.0.3. Issue #8.

splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl