zh_CN/*.lang.php re-worked

The legacy simplified Chinese i18n files from OpenX 2.8 were very much buggy.
These files are translated based on the latest version of en/*.lang.php, and saved with utf-8 encoding.
This is still an imcomplete version. But it is sufficient for working on most daily routines as the 'Default Manager' role.
Untranslated 'Campaign delivery' in openXReports plugin
Add zh_CN translatioin for five plugins

Again, these are incomplete, but are almost enough for daily work.

The five plugins are:
* openXBannerTypes
* openXDeliveryLimitations
* openXInvocationTags
* openXMaxMindGeoIP
* openXReports
Fixed #274
Fixed branding on the website Single Page Call invocation code tag page. #265
Fixed the display of the license on the install/upgrade welcome screen when using a non-root based installation process. #202
Readme file update for #202.
Deprecated unused (and uncorking) plugin update code. #82
Merge pull request #135 from leesah/zh-cn

Re-Work of Simplified Chinese Translations
Release notes update for translation updates in #135.
Merge pull request #139 from leesah/plugins-gettext

Add zh_CN translatioin for five plugins
Merge pull request #138 from leesah/oxReportsStandard

Untranslated 'Campaign delivery' in openXReports plugin
Merge branch 'master' of https://github.com/openx/openx-source
Repackaged the banner types plugin and updated the version number to include new Chinese translation files. Relates to changes in #139.
Repackaged the delivery limitations plugin and updated the version number to include new Chinese translation files. Relates to changes in #139.
Repackaged the invocation tags plugin to include new Chinese translation files (no version change required as already updated for the next release). Relates to changes in #139.
Repackaged the reports plugin and updated the version number to include new Chinese translation files. Relates to changes in #139.
Updated the MaxMind Geo IP plugin to include the latest free database from MaxMind. #262
Repackaged the MaxMind Geo IP plugin to include new Chinese translation files (no version change required as already updated for the next release). Relates to changes in #139.
Release note update for changes in #139