1.Updated readme with common info about project/plugin functionality
2. Updated pom.xml due to maven central repo requirements.
3. Added plugin for signing deployed jar
4. Added settings.xml with sonatype repos.
5. Added generated public key in project root directory
Merge pull request #9 from socialize/feature-LAPI-367-prepare-pom-xml-publish-to-maven-central

LAPI-367 https://sharethis.atlassian.net/browse/LAPI-367