wip: remove this when merged to develop

* Updated version to 4.5-SNAPSHOT
* Corrected typo in groupId tag
* Changed dependency from loci-common to loci-legacy (loci-common is an
  empty pom project that exists for backwards compatibility)
* Added scifio-tools to top-level pom.xml so it will be included on
  top-level maven commands and imports.
Fixed NPE when adding axes 1 at a time

If no axes existed, the axis arrays were null - as there was no reason
to construct empty arrays.

This condition is now checked and handled appropriately.
wip: AVIFormat