Update README.md

Change tutorial link (again). Do they keep changing this on github, or what?
Removing SPL
Added support for a gmt option to output time in GMT and fixed a bug with splunkstream outputs not properly getting the right sourcetypes if source remained constant but sourcetypes changed
Merge branch 'master' into dev
Change "gmt" setting to "timezone"
Support setting the timezone offset
Change documentation spec to new timezone
Update version number to tag this release
Fix check for 'own splunk app' to do case-insensitive comparison
It now looks for 'sa-eventgen' or 'eventgen' without regard for case
Merging Hemendra's changes