Merge pull request #22 from tommyjasmin/master

Allow user to label every Nth contour line [1375]
Merge pull request #23 from tommyjasmin/master

add a few custom javadoc tags, update API links [1055]
Merge pull request #24 from tommyjasmin/master

change empty string check to be backward-compatile with Java 1.5 [0]
Merge pull request #25 from tommyjasmin/master

back to 1.6 features [0]
Move to Java 1.6 for target
Merge pull request #26 from tomw2/isempty

Move to Java 1.6 for target
Move testing to use Java 1.6
Merge pull request #27 from tomw2/testscript

Move testing to use Java 1.6
A couple more moving to 1.6
Merge pull request #28 from tomw2/morebuild16

A couple more moving to 1.6
Add mailmap to improve "git shortlog -nse"