Use relative link for Release Notes

This gets the README to link to the Release Notes in the same git branch.
Add support for splunk 5.0.2 and correctly support splunk forwarders (in particular for splunk storm)
Revert to pallet 0.7.0 since can't seem to build against 0.7.1.
Update release notes and versions for splunk-0.7.0.alpha.1
[maven-release-plugin] prepare release splunk-0.7.0-alpha.1
[maven-release-plugin] prepare for next development iteration
Merge branch 'release/splunk-0.7.0.alpha.1'
Merge branch 'master' into develop