Ignore text nodes when parsing XMLAnnotation's value

This fixes an error parsing Modulo annotations
(e.g. FLIM-modulo-sample.ome.tiff) in Matlab.
Switch from net.imagej:ij to gov.nih.imagej:imagej

This prevents an indirect dependency on maven.imagej.net.
Updating TILL Photonics website link
Merge pull request #877 from hflynn/till-photonics-link

Updating TILL Photonics website link
Merge pull request #873 from melissalinkert/maven-ij

Switch from net.imagej:ij to gov.nih.imagej:imagej
Merge pull request #867 from melissalinkert/rebased/dev_5_0/xmlannotation-parsing

Ignore text nodes when parsing XMLAnnotation's value (rebased onto dev_5_0)