[GEOS-5993] Missing ElectronicMailAddress in WFS capabilities

In the WFS capabilities there were missing two important fields that are
present in the XSD. Those fields are ElectronicMailAddress and
DeliveryPoint.

This commit adds those two fields, but disregards the fact that there
can be more than one of both fields. However this patch could be adapted
to create a List or Array of both, so they are more faithful to the XSD.
[GEOS-5993] Added a test in the WFS Capabilities Transformer test for Contact information added to WFS.
[GEOS-5993] Added GUI support for DeliveryPoint and ElectronicMailAddress.
[GEOS-6712]Add charset definition in HTTP headers when returning textbased responses
[GEOS-6374] Added support for non-default style on layer in layergroup
[GEOS-6751] WFS can OOM when gzipping large compressible output
Resolving transient referenfces for ServiceInfo on load.
Resolving null collections for ServiceInfo on load
Merge pull request #793 from koordo/fix_wms_post_layergroup_styles

GEOS-6374 GetMapXmlReader always uses default style for layergroup layers
Merge pull request #788 from Damianofds/master-20141008-response_charset_management_improvement

[GEOS-6712]Add charset definition in HTTP headers when returning textbased responses
Merge pull request #801 from smithkm/jdbcconfig-transient-serviceinfo

Resolving transient referenfces for ServiceInfo on load in JDBCConfig
Merge pull request #799 from aaime/gzip_oom

[GEOS-6751] WFS can OOM when gzipping large compressible output
GEOS-6753: AuthenticationFilter extracting credentials from request headers in a configurable way
Implemented hashCode and equals methods.
Fix typo in documentation.
Merge pull request #809 from marcjansen/patch-2

Fix typo in documentation.
Merge pull request #807 from mbarto/credentials_from_http_header

GEOS-6753: AuthenticationFilter extracting credentials from request headers in a configurable way
[GEOS-6755] GSIP 119 - WPS clustering of asynchronous requests - architecture refactor to allow pluggable status sharing
GEOS-6757: Fixing latlon axis force management on WCS 2.0
GEOS-6753: fixed a randomly failing test