Started work on version 0.9.2

Planned changes:
- Addition of MARC data loader
- Addition of OAI-PMH data loader
Updated the readme file
Moved external dependencies from the parent pom.xml to the io pom.xml
Started the development of the OAI-PMH data loader
Added an XML namespace manager for the XPathRecord

Added a class that manages the XML namespaces for the
XPathRecords. For the moment, the namespaces are hardcoded for the
responses to the oai_dc namespaces, used by the OAIPMHDataLoader, but
it will be transformed to dynamically load the namespaces existing in
an XML string.
Added a first version of the OAI-PMH data loader.

What still needs to be done is the loading of a single record.
Added dom4j dependency in the parent pom.xml

We should start migrating away from org.w3c.dom classes into org.dom4j
classes and this is the first step.
Changed the OAI-PMH data loader to use the dom4j library

This change generalizes the data loader since it allows us to
effectively ignore the XML namespaces. It also simplifies the code and
the error conditions we need to check for.
OAI-PMH data loader now correctly loads one record if passed a correct data loading spec
Fixed a bug in the dspace output generator

Consecutive calls of the DSpaceOutputGenerator would overwrite the
output of the previous call, because the directory generation cas
reinitialized every time. Turned the variable cnt in the method
createOutput to a field, of the class and added setter and getter for
it, to be reinitialized if so desired.
Added java 1.6 environment dependency
Updated README.org

Updated the installation instructions for version 0.9.2, and added
dependencies, license and changelog sections.
Removing log4.xml since the configuration should come from the client
Added a getFields method in the Record interface

This method returns a Set of strings that contains all the keys that
exist in the Record.
Completed the changelog for version 0.9.2
Merge branch 'version-0.9.2'

Conflicts:
	README.org