fiji-lib: add NumberParser class

This class allows for worldwide parsing of numbers by respecting the
current Locale, unlike Integer.parseInt, Double.parseDouble, etc.

For details, see e.g.:
http://www.ibm.com/developerworks/java/library/j-numberformat/
TrackMate_: fix some dependency versions

Many of these worked by accident. The version of other sc.fiji projects
should be ${project.parent.version}, while the version of ImgLib2
dependencies should be ${imglib2.version}. Using ${imagej.version}
happened to work for now, since it is also at 2.0.0-SNAPSHOT here, but
the latest pom-scijava fixes version properties to release versions, and
the version numbers will inevitably diverge over time.
TrackMate_: use fiji-lib's NumberParser

This makes number parsing sensitive to the current locale, which should
allow numbers written with the expected local format to be parsed.
Merge pull request #22 from fiji/number-parsing

TrackMate number parsing
This merge result will be then uploaded to the update site, and left there for testing.