Add release notes for 0.18.0
Add release notes for 0.18.0

Changes included in this release:

    $ git log 0.17.0..0.18.0 --no-merges --oneline
    8b4456a Uncap library requirements for liberty
    76c9f68 Add unit tests for log_curl_request
    bd0aa06 Fix https stack trace on python 3.4 client
    c698b4e Fix client when using no ssl compression
    64a1a0f Add SSL cert verification regression tests
    c730266 Omit 'locations' as image-create parameter
    a6234d1 Creating task with invalid property crashes in py3
    fd2f989 Don't accept *args for client
    e386e44 Stub authentication requests rather than plugins
    27f70bb Remove keystoneclient mocks
    02b1a05 Replace mox in tests with requests-mock
    90407d9 Expose 'is_base' schema property attribute
    2c08b40 Validate tag name when filtering for images
    13b5a5a Remove redundant FakeSchemaAPI __init__ method
    c149a94 glance image-show now have --human-readable option
    42d7548 Test unit for checking update active images
    6d864ef Correct help messages for image-update command
    f272ab3 Generate API documentation
    a1bb3eb Use any instead of False in generator

Change-Id: I687bef82afd7bb9a379297d7128a009cc051ca75

mmasaki/python-glanceclient,klmitch/python-glanceclient,varunarya10/python-glanceclient,JioCloud/python-glanceclient,openstack/python-glanceclient,mmasaki/python-glanceclient,openstack/python-glanceclient,varunarya10/python-glanceclient,JioCloud/python-glanceclient,klmitch/python-glanceclient