Start the next release cycle

Maven only allows one single release version to be deployed, so let's
prepare for the next changes by switching to a snapshot version.

The snapshot version is in line with SemVer: http://semver.org/. In
short, SemVer suggests to

- increase the micro version for backwards-compatible bug fixes
- increase the minor version for backwards-compatible API changes
- increase the major version for backwards-incompatible changes

It is the rule that is followed by the ImageJ2 project, and more and
more also by Fiji projects.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge pull request #3 from fiji/post-3.4.0

Start the next release cycle
Update documentation comments
update release notes
Add a Bitdeli badge to README
Merge pull request #5 from bitdeli-chef/master

Add a Bitdeli Badge to README
Added addClickableMsg() to Sholl_Utils
Corrected text in error message
Fixed typo
Simplified clickableMsg. Added mouseListeners to each subheading
of the dialog prompt so that the respective documentation page is
opened when the user clicks on them
Sholl_Utils: Use java.awt.Cursor constants
pom: Corrected ImageJ version
Dialog prompt: Use listeners to validate End radius
Display center coordinates when displaying prompt
Updated Notes.md
Update README.md
Add offlineHelp()
Entab whitespace
offlineHelp() highlights both phases of image.
Improve csvPrompt()