Remove IMPORTER from lib/composite.py
Teach build.py to handle relative paths

Previously it was always necessary to be
in the top-level directory for build.py to
work properly. Now, if os.chdir is always
performed to the top-level, and if a build.xml
file is present in the current working dir
(before os.chdir) then it will be passed to
ant as "-f `pwd`/build.xml""

This allows:

  ../../../build.py test

and similar from OmeroPy etc.
merge develop --exclude conflict needs-fixes broken: PR 556 (FS-lite file security)
merge develop --exclude conflict needs-fixes broken: PR 573 (Figure scripts (rebased onto develop))
merge develop --exclude conflict needs-fixes broken: PR 577 (9821 Major FS refactoring)
merge develop --exclude conflict needs-fixes broken

Repository: openmicroscopy/openmicroscopy
Already up-to-date.
Merged PRs:
  # PR 556 joshmoore 'FS-lite file security'
  # PR 573 joshmoore 'Figure scripts (rebased onto develop)'
  # PR 577 joshmoore '9821 Major FS refactoring'

Repository: openmicroscopy/bioformats
Updating 96c615b..25bef48
Merged PRs:
  # PR 317 melissalinkert 'Add support for Inveon data'
  # PR 318 melissalinkert 'PR 201 on develop'
  # PR 319 melissalinkert 'Add support for JPEG-2000 compression with code 34712'
  # PR 320 melissalinkert 'ImageJ plugin option improvements'
  # PR 321 melissalinkert 'Sprint3 bug fixes develop'
  # PR 323 sbesson 'Extlinks review (rebased onto develop)'
  # PR 325 sbesson 'Return Bio-Formats version in bfCheckJavaPath() (rebased onto develop)'

Repository: ome/scripts
Updating 457e85a..272c83a

Repository: openmicroscopy/ome-documentation
Updating 2e32665..bc8e28f

Generated by OMERO-merge-develop#104 (http://hudson.openmicroscopy.org.uk/job/OMERO-merge-develop/104/)