Added support for ExtededData (XDATA).

All the data described in http://www.autodesk.com/techpubs/autocad/acad2000/dxf/index.htm are parsed and the 1002 block goes to a list of attributes.
The SimpleFeature returns a Map with the parsed data and with a list with 1002 attributes
Create readme

Initial readme
Update formatting
changes to support hsqldb upgrade to 2.2.8
removing alias from script
bumping EPSG database version
bumping EPSG database version
Fix DBF file writer so it preserves the value of all floating-point
numbers, including the "no-value" markers.
Correct gear-shifting criteria, additional tests.
Clean up shapefile DBF formatting code, preserve original format unless
data would be corrupted.
Enhanced tests.
Clean up test code.
Create README.md
Minor cleanup.
Merge remote-tracking branch 'origin/master'
update jdom version to 1.1.3
Merge remote-tracking branch 'upstream/master'
Revert README and buffer allocation changes.
Improve and comment unit test.
Make exception more precise.
[GEOT-4504] Build failure in gt-coverage-api CatalogSliceTest in path with spaces
Merge pull request #225 from bencaradocdavies/geot-4504

[GEOT-4504] Build failure in gt-coverage-api CatalogSliceTest in path wi...