Update README.md

Code snippet correction
Fixed - clusterGetServerStatus was misspelled as clusterGetServersStatus.
Added support for asynchronous operations.
By default the HTTP timeout is increased to 30 seconds.
Changed the current version to be 6.3.
Added support for ZS version 6.3.
Related ticket: https://github.com/zend-patterns/ZendServerSDK/issues/28
Added 1.7 API methods from the 1.3 branch.
Merge pull request #4 from YonmaN/patch-1

Update README.md
Update ApiManager to allow raw ZS WebAPI output

just the raw xml data is logged/put to stderr/stdout if environment var RAW_ZS_OUTPUT has been set
Merge pull request #6 from janatzend/master

Update ApiManager to allow raw ZS WebAPI output
fixed typo in WebAPI method name

the WebAPI method is called monitorGetIssueDetails (not monitorGetIssuesDetails)
Merge pull request #7 from janatzend/master

fixed typo in WebAPI method name
Fixed the declaration of applicationDeploy to match its documentation.