refactored GRASS backend
JavaDoc and tests for LiteralDataFactory
fixed incorrect binding type for floats
ported io-impl tests to junit 4
removed trailing whitespace/minor refactorings
refactored database module

TODO:
* distinguish between status pages/stored outputs in
  RetrieveResultServlet
* Configuration
refactored execute response building
Format factory method for OutputDefinitionType
cleaned up generators and parsers
added missing throws declaration
refactored CoordinateTransformAlgorithm
fixed io-impl tests
allow null configuration to default to FlatFileDatabase
copy gzipped files for getAsFileMethods
fixed test cases

* use WPSConfigRule
* way simpler ProcessDescription generation
Cleaned up dependency management
* declaration of used transitive dependencies
* excludes for commons-logging
* common dependencies for every project
    * junit
    * hamcrest
    * slf4j