extractorapp & mapfishapp pom.xml revamp

This commit automatizes the exclusion of redundant imageIO and gdal java
bindings. This would force the system administrators to ensure that
tomcat is properly configured to allow the JVM to be able to resolve
extra jars that should be provided by the distribution (jai, imageIO and
gdal).
Ignoring eclipse autogenerated files

Conflicts:
	analytics/src/main/webapp/site/js/lib/external/ext
Improving GDAL/OGR handling in extractorapp

- Check if native libs are available at bean instantiation
- Excluding some redundant jars at build time: have twice the gdal/ogr
  bindings could lead to version issues. In addition, we should use the
  generated bindings coming with the targeted native libs.
- Better logging if unavailable libs.

TODO:
- Propagate the modifications to other concerned webapps (mapfishapp,
  geoserver).

Conflicts:
	analytics/src/main/webapp/site/js/lib/external/ext
	extractorapp/pom.xml
	extractorapp/src/main/java/org/georchestra/extractorapp/ws/extractor/OGRFeatureWriter.java
XMLlint'ing extractorapp's pom.xml
Removing gdal dependency from mapfishapp's pom.xml
XMLLint'ing mapfishapp's pom.xml
Restoring extractorapp's pom.xml version
Fixing build (extractorapp)
Fixing bug with KML export

Driver misnamed "KML File" -> "KML"
Extractorapp: Using OGR to produce KML
Merge remote-tracking branch 'origin/13.09' into 13.09