Add code about partice (sequence, choice, all) descriptor entity.
This functionality has not been tested yet.

Some functionality about difference computing have been commented for code compilation. At this time difference computing is down.
Some test has been added
A huge part of the system has been refactored and changed.
It's more convenient to show diff info then write any comments :)
Some bugs has been fixed.
All test about comparison simple XSDs (without nested indicators) - are passed.

There aren't any test about comparison complex XSDs (with nested indicators).
Processing of a types contains nested indicators difference has been implemented.
Root package name has been changed from 'com' to 'ru'.
pom-version has been changed from 1.0-SNAPSHOT to 2.0-SNAPSHOT
At this time a type may be null - XmlSchema:1.4.7 library presents xsd:anyType as null/
This fix contains additional check for the NULL-value of an element type.
Apache XmlSchema 1.4.7 library has been replaced by Apache XmlSchema-Core 2.0.3 with some code changes in accordance with XmlSchema API changes.
Some company-relate info has been deleted.
Some old commented code has been deleted in TypeDescriptor.java
Merge remote-tracking branch 'remotes/origin/xmlschema_2_0_3_migration' into nested_sequence_choice_processing
View models and a service class created them have been moved from the WSDLCOMPARATOR-WC project to this one.

Folder element has been renamed to descriptors.
Descriptor classes have been grouped in one folder - descriptors.
Remove some unused methods from ViewModelCreator.java
Some bugs have been fixed
Some bugs has been fixed.
Some small enhancement have been added.

Two additional deference types have been added to DiffWSMethodInfo.java: RESPONSE_DEL and RESPONSE_ADD. A business-logic for processing the diff. types has been implemented.

In IndicatorDescrRow.java "root" field has been added: it's set tot true for root type indicator.
In IndicatorDescrRow.java "id" field has been added.
A separator in an indicator id string has been changed from "_" to "|".
Algorithm of computing equivalence group indicators that are nested in CHOICE indicator has been improved - see IndicatorDescriptor#equals method.
An unit test has been created in accordance with this improving.

DiffInfo class has been renamed to TypeDiffInfo because it describes a difference between two xml schema types.
JavaDoc and Source maven plugins have been added in the pom.xml
JavaDoc and Source maven plugins have been added to the pom.xml
A mergeWithBaseType flag for a type has got RESTRICTION content model is hard reset to false.

If "OLD" wsdl file is not set then a description and model are built by a "NEW" wsdl only without any comparison.
TypeDescrTable#hashCode method wrong implementation has been fixed

In TypeDescrTable#createModelByTd method is performing check about given processed TypeDescriptor is already created for double-processing prevention.
A comment fixed