Merge branch 'feature/rounded-button' of https://github.com/chrismay2/echo3

This change provides the possibility to give buttons a rounded
style using CSS3 based capabilities.
According to http://caniuse.com/border-radius this is supported
beginning with IE9 and all other current browsers (including
long-term editions).

Maybe we want to explicitly drop support for those outdated
browsers beginning with 3.1.x?
Fix release version from 3.0 to 3.0.0
Prepare Maven release support according to SonarTypes requirements

- Update POM definitions as required
- Generate & Provide -javadoc.jar files
Rework mvn call
Switch to Maven ant task instead manually calling mvn.
Use Maven install-Task for installing instead mvn-Task because javadoc/sources didn't work.
Ant targets & configuration for Central Maven Snapshot & Staging repository.
Merge branch 'feature/maven-deployment' into 3.0.0
Merge branch 'feature/maven-deployment'
Maven POM: minor fix in developer list
Maven Deployment: Use Ant macros to reduce copy&paste bloat.
Fixup merge of branch 'feature/maven-deployment'
Fix JSLint check error
Fix JavaDoc erros which fail the travis CI.
Fixup Merge of branch 'feature/rounded-button'
Continuous Integration using FOSS travis-ci.org

Travis in java profiles with Ant build files calls by default the test
target, so I included the JSLint check in this test target.
Test & Fail on JavaDoc Warnings & Errors
Merge tag 'v3.0.0' to allow this a good rebase target

For providing changes which should go into 3.0.x and 3.1.x use v3.0.0 as
branch spinoff.

This merge is a pure marker merge to tell Git, that v3.0.0 is fully included
in v3.0.x and v3.1.x.
Merge branch 'feature/travis-ci' of https://github.com/exxcellent/echo3

Enables continous integration using the amazing travis-ci.org
service for FOSS projects.
Refocus Sync.ListComponent's select element if it was focused before renderUpdate.

renderUpdate removes the old select field and creates a new one,
disregarding the previous browser focus state. This bugfix focuses the
new select field if the old one was focused.