Merge pull request #158 from mnunberg/stage

Update release notes for Python SDK 1.2.3
Python SDK: edit release notes
release notes for Ruby and update to home page
.NET SDK: fix typo (NCBC-629)
index.html: update link to Python API reference
.NET SDK: add 2.0 beta developer guide
Server 3.0: update beta docs
repair
index.html: update links for Server intro and release notes
index.html: capitalize something
update SDKs
publish 2.0 SDKs for Java, Node, and PHP
node sdk fix build errors
index.html: update links for PHP and Node API references
Release notes for C client 2.4.2