Modfiy for new clients
revise install procedures in QuickStart (fix #69)
update client library version in pom.xml
update command usage (renamed from keeper to proxy, add --mixer option)
update lineup of the library
renamed from keeper to proxy in tutorial_distributed.rst
add clustering to overview
replace CRLF with LF
renamed from keeper to proxy in overview/architecture.rst
add clustering to overview/feature.rst
renamed from keeper to proxy in faq.rst
Rename to proxy from keeper and use blockdiag in en/processes.rst
Use blockdiag insted of static image in en/tutorial_distributed.rst
Use blockdiag insted of static image in en/tutorial.rst
Rename to Proxy form Keeper, Update generated source list, Update IDL sample, Add extlib to build requirements in server.rst
Renamed to proxy from keeper in en/admin.rst
Fix reference of api
Merge pull request #70 from unnonouno/new-client

Modfiy for new clients
Fix tiny typos in API reference
Merge branch 'release/0.5.0' into develop