Fixed a couple of typos.

Thanks to Felix Petriconi for the tip.
Updated contributors list.
Adding a host option as a DServer parameter

This fixes an issue where the DServer on some systems would
unexpectedly bind against a IPv6 interface. Now it defaults to
127.0.0.1, but can be specified if another option is desired. Thanks to
Felix Petriconi for working on the issue.
Added a couple of links to README
Update year.
Updating rakefile and dependencies

Updated a few development dependencies.
Got rid of some deprecation warnings from the rakefile.
Changed the rakefile examples to use bundle exec, as is the proper way
to do it with bundler.
Minor documentation update

Specified that the UID constant is the DICOM UID root of ruby-dicom.
Fixed an image warning issue

A warning was not properly logged when an image failed to load on a
dicom file with compressed pixel data.
Also added a description of the compression algorithm to the warning
for improved debugging.
Added a sample with invalid comression data.
Adding JSON audit_trail feature.
Merge pull request #34 from cbmi/jsonaudit2

Adding JSON audit_trail feature.
Refinements to the new AuditTrail

Added documentation and specification examples.
Rearranged and cleaned up the code somewhat.
Added a general module method for UID generation.
Added a json example to the samples folder.
Added contributor

Added Jeff Miller to the list following his AuditTrail contribution to
the Anonymizer class.
Added UID anonymization

Implemented a proper UID anonymization (SOP Instance, Study, Series &
Frame UID) with AuditTrail support and preservation of relations.
Some cleanup in the Anonymization class.
Deprecated the identity_file feature.
Added Accession Number to the default list of tags that are anonymized
(and enumerated).
Specify tags to be removed during anonymization.
Merge pull request #35 from cbmi/removetags

Specify tags to be removed during anonymization.
Documentation update.
Fixed an incorrect description in the new generate_uid method.
Fixed incorrect handling of 3D NArrays

Fixed an issue where 3-dimensional NArrays were not correctly encoded
to / decoded from the DICOM object. This turns out to be regression
from v 0.8. Specs added for this case as well.
Also improved a couple of error messages related to pixel
encoding/decoding.
Added comparison methods to Element

Added comparison methods ==(), eql?, hash and state to the Element
class.
Added a to_element method which returns self.
Added comparison methods

Added comparison methods ==(), eql?, hash and state to the DObject,
Item and Sequence classes.
Added a to_dcm, to_item and to_sequence methods to the respective
classes as well.
Changed variable obj to dcm

Changed the DObject used variable name from obj to dcm in all cases:
README, documentation, library code and specs.